A micro controller with inputs for 10 cameras, 2 PUSH buttons, an output for the selected video and one for telling you current selected camera.
If you want LESS than ten cameras simply select the UP/DOWN unit and decrease the clamp
There is no easy way to make more than ten cameras, it is possible but there's no easy way to explain it.
I designed this for my FNaF in stormworks experiment which i will upload soon.
