MotionTrackOSC is a small program that does motiontracking on either a camera image or a video file. The tracked motion is output to a client via osc.
I wrote the program using opencv v1.1pre1 on Linux, though maybe an earlier version of OpenCV (such as shipped with Debian or other distributions) will also work.
I did NOT yet use the newest version of liblo (v0.25 or higher), since that is not shipped with Debian unstable yet (even though it has a really nice feature).
MotionTrackOSC is distributed with some SuperCollider classes and help files, so you can start and use the program from and with that program.