Simple live viewing recommendation

I'm looking to put a camera inside a church, and send video to the "cry room" so mothers can see the pastor during sermons. The camera would sit at the back of the sanctuary, maybe about 70-100 feet from the pastor, and 10-12 feet above the floor. The cable run would be only about 20 feet long. It would attach to an LCD television, but HD is not necessary, just something that looks decent.

Any recommendations? The box cameras look appropriate. Maybe with a 16 mm lens? We want to zoom in on the pastor from the back of the room.

The lighting situation is pretty good. How many lines of resolution should I look for? 320 TV lines seems to be the lowest available.

Can the BNC connector be adapted to coax/RCA/VGA directly, or does there need to be some device between the camera and the TV?

Any help is greatly appreciated!