just need an RCA cable .. you can get them from any electronic store ...
you may already have one lying around from a digital camera or other device .. then you can use the BNC-MALE to RCA-FEMALE Adapter ...
Or for higher quality use Coax (RG59 Copper in and out, solid center) and use a BNC-FEMALE to RCA-MALE ...
Better yet, depends on the camera, if it has S-VHs out .. use that for even higher quality. You would simpy need the S-Vhs cable.
RCA cable is pretty much the most common method though.