How Interact with ContourFinder(Contour detected -OfxOpencv),blobs VS Some kind of objects,like a simple circle or a system particle for instance?

Oops just saw this. This might not be what you are looking for but in my ofxOpenVJ during a hackathon I created a scene that had box2d particles along with openCV outlines - you can dig around here :

https://github.com/benMcChesney/ofxOpenVJ/tree/f27812329ce603fbf304dca3abf7a9542009f8c6/KinectBox2d_Outlines