[jitter] 2d Position Tracking in Low Light

Hi there, I'm looking to track a small point on a performer's instrument in a low lit space. I simply want to have the x/y values for this point. I've thought about tracking color but imagine the low light might make this difficult. So I've been more inclined to use infrared tracking, using a small infrared reflector and bathing the stage in infrared light, or just placing a small infrared emitting LED on the performer. Either solution would be fine, I am just concerned with cost and mostly simplicity - I need to get the tracking system up and running asap. Any thoughts would be much appreciated. Thanks for any help!

-Kevin