There's already cheap technology to do this using a Wii remote camera attached to the screen and a pair of IR LEDS mounted on your glasses.
Those low resolution IR cameras must have been produced in such huge quantities I bet they are pretty cheap now. You can buy a Wii-mote for $50 retail and that includes lots of expensive hardware you don't need such as a bluetooth transceiver and a pair of accelerometers.
Those low resolution IR cameras must have been produced in such huge quantities I bet they are pretty cheap now. You can buy a Wii-mote for $50 retail and that includes lots of expensive hardware you don't need such as a bluetooth transceiver and a pair of accelerometers.