Hi,
Track"IR" works with ir lights and a very sensitive cam, (and it works rather good.)
You do necessarily need a ir-light source, otherwise your webcam will catch all visible light around you.
I did some tests with a dozen of ir LEDs as a kind of spot.
I've tried it with a Logitech 5000 pro without success because of a lack of sensitivity for the reflected IR light.
No idea if there are IR bulbs with standart sockets. (I do not recommend medical heat infrared lamps except you need to heat your home.
)
For a daylight filter solution:
Scotch tape
Colored sheets