I've been trying to work this out for about a week now, but I can't get my head around how to get the motion detection from a webcam to trigger another video file being played and that being projected.

• I can set up a webcam motion detection fine

• I can playback a video fine (though only once, how do you reset at the end of playback ready to be played again - only when activated - not looped?)

• I think I understand how to offset and resize the video playback for it to be projected

What I can't seem to work out is how to have webcam input trigger a separate video file output - I'm probably missing something really simple after all I am a complete and utter noob!
I'm using PD extended on a mac El capitan but will also be implementing this on a mac book pro.
If this can't be done I'm considering getting a Pi and doing it that way as I've seen a few how to's online, that would also allow additional sensor triggers for different video files to be projected hopefully.

Any help out there would be very welcome as my head is about to implode.