The Kinect sensor is scanning your body in real time, witch is cool. But let me ask: how does the Kinect compare to the TrackIR sensor for scanning minute head movements and move or rotate the 3D view within a game in real time?
Why would you want this in the first place?
Here is an example in F1 2010 with TrackIR : The player moves and rotates it's head while driving and the view moves accordingly within the cockpit. It's fluid and natural and it brings a lot to the immersion in the game.
How it works: the webcam reads your head movements and turns / move the camera accordingly with 6 degree of freedom.
Advantages in games: No more blind corners in FPS, you can also naturally turn your head in the curve while cornering in a car game (like a pilot would do), and finally you can keep an eye on you ennemy or your airport in a flight sim, as you would in reality.