Have a look at syphon to share graphics amongst applications (running on the same machine), google syphon pure data for details how to make syphon work with pd. For processing there is a syphon library that works fine with 2.0a8

andreas schlegel, http://www.sojamo.de

I can't find any information about sending video into puredata using syphon, just from puredata via syphon to other applications. I found a tutorial on sending video from PD into other applications (here: tutorial), but the patch that this person offers calls for a UDP port that I can't use. Do you know of any other documentation?