Make sure you have a webcam connected to the PC or Laptop or any devices do you use. Then, you may allow the use of webcam through the web browser as well. You will see the Sprite "Felix" disappear when the video motion is above 50, the video motion indicator is shown in the top-right corner of the screen. Then, press the "space" button on your keyboard to make Felix coming back. You may iterate this step as you wish and happy learning.
