for a schoolproject we need to make a prototype installation for a shop window. Our idea is kind of stolen from this v ideo. We want to make a sort of  wishi washi system. In our case we want people to clean a big tv screen. After they swiped off the "dirt", a commercial or product will show that they sell in the shop. I  got some great help from friends already, they recommended these sites  http://www.shiffman.net/p5/kinect/  and  https://github.com/ofTheo/ofxKinect

We made some great progress and got the kinect to actually detect  us. Right now we got the kinect to detect us, we can make the screen black and only "see through"  at the point where it detects a body, this works on Frame Differencing. The problem is that it becomes black right after you move the body. We would like to have a delay in that so the image behind the black layer is visible for a longer time. And for some reason the silhouette from our body flashes from black to the image behind it, its not smooth at all. And it won't fill up the whole screen, it is always windowed which is kind of a bummer. Anyone got experience with it? We could post our code if needed. Thanks in advance :)