How to connect and see video from composite output camera

Dear Bros,

I have a camera with composite video signal output. Commonly, it is connected to TV to see what camera can see. But now i want to see it on my Mac Pro instead of the television.

I wonder what hardware (and software, maybe...) do i need and how to set it up ?
Please give me some ideas or links that i could find the way out.
The cheaper way is prefer.

Thank you very much for your help !

 

Thanks for your reply. For sure, if i just need to see on the monitor and it has composite input, there will be nothing to ask
I need to watch on my Macbook Pro laptop which seems to have only input through usb port.

I just read the Elgato Eye TV you suggested, may have to try it if no other choice, but still hope that have some options to choose, and any device that i could work on both Mac OS and Windows ?

Many thanks for all !