You can use the CMUcam2 with just a PC using either the LabView or Java CMUcam GUI programs. You will need to make an adapter cable to plug the backup battery into the J2 power connector on the CMUcam. You can use a PWM cable for this (the black negative lead goes to the top of the connector).
To learn about the CMUcam, the best place to start is
here.
Good luck and post back when you have more questions (after reading Kevin's excellent FAQ and the CMUcam manual).