Hey I am wanting to create a live movement piece that triggers audio, I am new to PD and am wanting to write or find a patch that can do this. the samples will be pre-recoded in either live or logic. Then I wanted to trigger them when a part of my body crosses a specified pixel/s on the camera that is framed on me and fed into Pd, make sense??

Does anyone know of patches that do a similar thing that i could learn from, or know what it maybe termed by others so i have an idea of what to search for, and what apps. am i looking at using? GEM I assume, anything else?
I use OSX

cheers.