Allow the Flash Player below access to your webcam. If you are on a Mac you may need to change the settings for your webcam to work. -> Right-click on the Flash Player -> Choose Settings -> Click on the Webcam-Icon -> Try some camera-settings from the drop-down-list untill you get an image.
Point your webcam at the printed AR marker. Manipulate the animation by moving the marker. You can turn the music on/off with the button below.