Thanks to all for the helpful info. Especially, to Ben for widening my idea of what resources exist.
There are a large number of Graphics/Video libs for PD including: GridFlow (matrix operations), Framestein (windows only), PDP (something more like softVideo), and PiDiP (nice extra stuff on top of PDP), and of course Gem.
So now my task is to try to narrow my search to the appropriate tools for the task. Here is what I am planning (its not too complex):
grab video from camera in real-time periodically save it to a file(s) chroma key it as it is displayed concurrently display previously-saved video(s) behind the current real-time video apply diverse effects in real-time to the previously-saved video files that have been loaded in vary the amount of these effects according to gradiant input from a motion sensor
Could anyone suggest what combination of these tools might be most appropriately suited for this set of tasks?
Thanks in advance,
Jhave