At first, I put a specific colour of rectangle on the screen and used chroma key to take the colour off, replace it with a slice of video, but the problem was if there is anything contains the colour, Isadora will take is off as well. So I tried using the corp function, and after I set a series of complicated math calculation formulas, it worked perfectly.
I tried both background difference and frame difference for the tracking. For the background difference, because it's so sensitive, when there are more than one viewers in the screen, it could hardly determine the position of the viewer. And the frame difference only recognizes the moving objects, so it's less sensitive. As long as the objects don't move, it doesn't detect them. And I think it's perfect for tracking the viewer's position.
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