Take square image with Cordova (Phonegap) Camera API?

    <script src="assets/js/cordova-2.0.0.js"></script>
    <script type="text/javascript" charset="utf-8">

        // Called when capture operation is finished
        //
        function captureSuccess(mediaFiles) {
            //var i, len;
            //for (i = 0, len = mediaFiles.length; i < len; i += 1) {
            //    //uploadFile(mediaFiles[i]);
            //}
            //navigator.notification.alert('Weee', null, 'Great success!');
        }

        // Called if something bad happens.
        // 
        function captureError(error) {
            //var msg = 'An error occurred during capture: ' + error.code;
            //navigator.notification.alert(msg, null, 'Uh oh!');
        }

        // A button will call this function
        //
        function captureImage() {
            // Launch device camera application, 
            // allowing user to capture up to 2 images
            navigator.device.capture.captureImage(captureSuccess, captureError, { limit: 2 });
        }

        // Upload files to server
        function uploadFile(mediaFile) {
            var ft = new FileTransfer(),
                path = mediaFile.fullPath,
                name = mediaFile.name;

            ft.upload(path,
                "http://my.domain.com/upload.php",
                function (result) {
                    console.log('Upload success: ' + result.responseCode);
                    console.log(result.bytesSent + ' bytes sent');
                },
                function (error) {
                    console.log('Error uploading file ' + path + ': ' + error.code);
                },
                { fileName: name });
        }
    </script>


    <script type="text/javascript" charset="utf-8">

        var pictureSource;   // picture source
        var destinationType; // sets the format of returned value 

        // Wait for Cordova to connect with the device
        //
        function onLoad() { document.addEventListener("deviceready", onDeviceReady, false); }

        // Cordova is ready to be used!
        //
        function onDeviceReady() {
            pictureSource = navigator.camera.PictureSourceType;
            destinationType = navigator.camera.DestinationType;
            alert("device is ready");
        }

        // Called when a photo is successfully retrieved
        //
        function onPhotoDataSuccess(imageData) {
            // Uncomment to view the base64 encoded image data
            // console.log(imageData);

            // Get image handle
            //
            var smallImage = document.getElementById('smallImage');

            // Unhide image elements
            //
            smallImage.style.display = 'block';

            // Show the captured photo
            // The inline CSS rules are used to resize the image
            //
            smallImage.src = "data:image/jpeg;base64," + imageData;
        }

        // Called when a photo is successfully retrieved
        //
        function onPhotoURISuccess(imageURI) {
            // Uncomment to view the image file URI 
            // console.log(imageURI);

            // Get image handle
            //
            var largeImage = document.getElementById('largeImage');

            // Unhide image elements
            //
            largeImage.style.display = 'block';

            // Show the captured photo
            // The inline CSS rules are used to resize the image
            //
            largeImage.src = imageURI;
        }

        // A button will call this function
        //
        function capturePhoto() {
            // Take picture using device camera and retrieve image as base64-encoded string
            navigator.camera.getPicture(onPhotoDataSuccess, onFail, {
                quality: 50,
                destinationType: destinationType.DATA_URL
            });
        }

        // A button will call this function
        //
        function capturePhotoEdit() {
            // Take picture using device camera, allow edit, and retrieve image as base64-encoded string  
            navigator.camera.getPicture(onPhotoDataSuccess, onFail, {
                quality: 20, allowEdit: true,
                destinationType: destinationType.DATA_URL
            });
        }

        // A button will call this function
        //
        function getPhoto(source) {
            // Retrieve image file location from specified source
            navigator.camera.getPicture(onPhotoURISuccess, onFail, {
                quality: 50,
                destinationType: destinationType.FILE_URI,
                sourceType: source
            });
        }

        // Called if something bad happens.
        // 
        function onFail(message) {
            alert('Failed because: ' + message);
        }

    </script>
</head>
<body onLoad="onLoad()">
    <button onclick="capturePhoto();">Capture Photo</button> <br><br>
    <button onclick="capturePhotoEdit();">Capture Editable Photo</button> <br><br>
    <button onclick="getPhoto(pictureSource.PHOTOLIBRARY);">From Photo Library</button><br><br>
    <button onclick="getPhoto(pictureSource.SAVEDPHOTOALBUM);">From Photo Album</button><br><br>
    <img style="display:none;width:60px;height:60px;" id="smallImage" src="" />
    <img style="display:none;" id="largeImage" src="" />
    <br><button onclick="captureImage();">Capture Image</button> <br>

    <?xml version="1.0" encoding="UTF-8"?>
<widget xmlns       = "http://www.w3.org/ns/widgets"
xmlns:gap   = "http://phonegap.com/ns/1.0"
id      = "com.phonegap.getting.started"
version     = "1.0.0">

<name>bla</name>

<description>
    bla
</description>

<author href="http://bla.github.com"
    email="bla@gmail.com">
    bla
</author>

<icon src="icon.png" gap:role="default" />

<feature name="http://api.phonegap.com/1.0/geolocation"/>
<feature name="http://api.phonegap.com/1.0/network"/>
  <feature name="http://api.phonegap.com/1.0/file"/>
  <feature name="http://api.phonegap.com/1.0/camera"/>
  <feature name="http://api.phonegap.com/1.0/media"/>
  <feature name="http://api.phonegap.com/1.0/device"/>

  <feature name="http://api.phonegap.com/1.0/notification"/>
  <feature name="http://api.phonegap.com/1.0/battery"/>

<preference name="orientation" value="portrait" />
<preference name="webviewbounce" value="false" />
<preference name="prerendered-icon" value="true" />
  <preference name="phonegap-version" value="2.0.0" />

  <preference name="fullscreen" value="false" />
  <preference name="stay-in-webview" value="false" />
  <preference name="ios-statusbarstyle" value="default" />
  <preference name="android-minSdkVersion" value="7" />
  <preference name="android-installLocation" value="internalOnly" />
  <preference name="target-device" value="universal" />
  <preference name="autohide-splashscreen" value="true" />
  <preference name="load-url-timeout" value="60000" />
  <preference name="show-splashscreen-spinner" value="true" />
  <preference name="show-splash-screen-spinner" value="true" />
  <preference name="allow-inline-media-playback" value="false" />
  <preference name="launch-mode" value="standard" />


  <plugin name="Capture" value="CDVCapture" />
  <plugin name="Camera" value="CDVCamera" />
</widget>

$ cordova plugin add cordova.plugins.diagnostic

cordova.plugins.diagnostic.isCameraAuthorized(function(authorized){
    if(!authorized){
        // Display some message to user
    }
}, function(error){
    console.error("The following error occurred: "+error);
});