Here's the setup: I'm projecting my video onto a screen, and I want people to be able to interact with the projected image - for example, someone goes up and waves their hand in front of the image, and the video of just their motion gets sent to Jitter. I need to be able to capture just the people and not the video, otherwise motion in the video gets captured and causes a runaway feedback loop. The easiest way I can think of to capture just the people in front of the screen is using a thermal infrared camera, which would detect body heat and not detect the projected image at all. Unfortunately these cameras appear to run in the tens of thousands of dollars, which is out of budget for my broke ass. I'm trying to come up with a cheaper alternative that accomplishes the same thing.
Can anybody suggest a relatively cheap way to capture just the people in front of the screen while filtering out the video projection? Or do you know where I could get a thermal infrared camera for cheaper, like under $1000?