Here is some research into using a USB webcam for player position tracking
open source Camervision software designed to track blobs.
* http://nuigroup.com/touchlib/
* http://nuicode.com/projects/tbeta
Camera Suppliers
Here is a supplier of research grade camera and lens (sold separately):
* http://www.ptgrey.com/index.asp
* http://www.bhphotovideo.com/c/product/414244-REG/Tamron_13FM08IR_13FM08I…
total cost $304.00
Might be better to go with a Playstation Eye
* http://en.wikipedia.org/wiki/PlayStation_Eye
* http://codelaboratories.com/products/eye/sdk/
total cost $32.00
NIR Band Pass Filter
* http://shop.ebay.com/omegabob2/m.html?_nkw=&_armrs=1&_from=&_ipg=
Pico-ITX
* http://www.logicsupply.com/products/artigo_a1100
total cost with add ons: $396.00