No idea. I'm going to try out this one motion capture deal called iPi Desktop Motion Capture. It seems like it could be easy enough. I just downloaded it because there is a free demo, and it's only 20 MB. I have a really slow connection, so I take the smallest and cheapest can get. :P
First I need a computer that is compatible with 4.0 shaders or something. Hopefully my next one will be.