Interfacing a CCTV camera (AV output) with Arduino Uno
Unfortunately, I have to tell you that a UNO isn't enough powerful to work with any type of camera: it hasn't got enough ram and processing power to elaborate your camera's data. (see atmega328P's specs)

I'm not sure you can work with that camera, unless it is digital and has integrated RAM to keep the frames.

A good project which I suggest you to see is arducam.