I can find full blown systems just fine, and I can find hobby-level systems where all the coding is done for you just fine. What I can't seem to find are cameras where the output is predigitized so that I can do whatever I want with the data with my own processor.
Vinod, here are some cameras where the lowl leve imaging process code is done for you (use Google):
POB Technologies
CMU Cam
These are hobbyist level cameras where the camera and the processor are on a PCB and a lot (if not all) the image processing code is done for you, like blob tracking, etc. You just need a separate MCU to decide what you want to do with what the camera tells you is going on.