Need help, vision system for robot?

Okay, so I am building a robot for school, and basically all I need is a program that can download frames from a camera analyze them and see a "path".

I will be using a vehicle that kids drive in (like when they are toddlers) and I am going to need to know wtf I need to do... ANY help would be lovely, thanks <3

>>6
They limit the number of motors?
I distinctly remember some other teams' robots with omniwheels driven by 4 individual motors.