What need to be added into the following Processing in order to produce a mosaic effect when the webcam is on?

P WebcamExample Processing 2.2.1 File Edit Sketch Tools Help WebcamExample limport processing.video.*; // import the video libaray (necessary library for webcam) Capture img; // use to capture a webcam image void setup() { size(320, 240); // window size: 320 x 240 pixels img = new Capture(this, 320, 240); // specify a webcam image with size: 320 x 240 pixels img.start(); // start capturing frames (images) from the webcam } void draw() { if (img.available() == true ) //if a new frame is available { img.read(); // read the current frame from the webcam image(img, 0, 0); // display the image } }