Quote:It's simply not (yet) possible to control an FPS that way. FPSs are way to complicated, and the Kinect is not yet accurate enough to reliably capture things like moving your index finger to shoot.
Its still a little crude but
http://kinecthacks.net/controlling-quake-with-kinect/
Edit: Maybe a model gun with a switch bluetoothed/wirelessly connected to the PC may compensate for the inaccuracy for firing.