Kinda reminds me of Logitech's face tracking and effects except the object being tracked is the big X on the card. [ame=http://www.youtube.com/watch?v=C0A19tiyimU]YouTube - Logitech Webcam[/ame]
That was my first thought, i'd imagine that at the rate that this type of technology is improving it won't be too long before we see it.
WOOAAHH!!! I am really high right now but that shit is cool, i can just imagine something like that being used in the first virtual reality games