I am fairly new to processing and have made all best attempts to find my own answers but I am stuck at a few points.

one, I am looking to capture data from a webcam using the webcamxtra extenstion to determine movement within a live video stream.  I want to take this position / location information and stream it out of processing to take into a third-party 3d modeling software.  The hope is to find a way, such as a serial stream, that would work.  So far, I have determined I can receive a serial stream into the software but they all examples are intended to receive from an outside source, such as an arduino board.  I realize this is vague but I am just at a starting point so any advice is appreciated.

two, I want to take this 3d model and bring it back into processing, essentially add the 3d image back into processing over the top of the video stream.  If needed, this could happen on a second machine but I cannot seem to determine if processing has this capablity, to combine two video streams.

Thanks in advance for any assistance, I am very early into the process and hoping to move this forward