This is like the head tracking with the wiimote but all that is needed is a pc and a webcam, even my very low quality webcam works!
Step 1: Connect a Webcam...
Connect your webcam. the software requires that the webcam is connected and working before it is opened.
Make sure the webcam is above the screen roughly in the middle across the top.
Doesnt matter how good the cam is really although im assuming a better camera might work better than mine.