Well, I do not know where to start.
So I am posting this.
The idea is to build a camera system of 4 or more cameras. The video must be able to be seen on my laptop (wireless) in real time so I guess I have to build a program for it too, I'm gonna program it with JAVA.
Further upgrades might be pan/tilt functions.
Keeping the cost to less than $100
Anyway, this is only the "is it feasible?" phase of the project.
PS: Suggestions greatly appreciated.