What node can do CMVision blob tracking?

edit

I got CMVision blob tracking to work (Ubuntu 10.04 & Diamond ROS), now I could really use a node to read subscribe to the published blobs, and publish R/C servo camera tracking.
I've started to write a node, and I've studied the headers, but it's not clear to me what structure I need for the blobs. If I can subscribe to the blobs, I can work out the centroid of the biggest blob or two, and then probably publish a servo command to the ros_arduino_bridge.

Surely there is already a node to read the blobs that I can use or study!

Thanks,

Alan KM6VV