I've been doing a little searching on the web and experimenting. There are youtube videos of mounting a video camera on a rifle scope and some videos using the IR capabilities of video cameras to make economical IR night vision rifle scopes. I saw a video of someone shooting rats that looked pretty neat.
I bought a wireless network camera and have it in my carport now. Saw a skunk coming up and getting into the cat food. Anyway, I tried and the network camera could see the IR from the TV remote, not sure if it has an IR filter or not. The thing I like least about this camera is that there is a lag between live and the image I get on my PC. I think it would be better to use some wireless cameral that transmits a video signal instead of network data.
I also tried my camcorder looking through my rifle scope and a red dot sight and that worked great. I wasn't sure if it would require a lens to focus, but it doesn't, just needs to be held aligned.
Anyway I was looking for IR illuminators on eBay and found some IR laser sights. They said you had to use night vision or a camera to see the dot, sounds perfect. I'm thinking that if I make my gun turret balanced or counter-balanced it shouldn't take much RC servo torque to aim it. I may experiment with something like a Gamo air rifle for now and later make a gun & camera I can use on an RC vehicle. I have a Traxxas E-Max 4x4 RC truck that could handle a small gun & camera setup.
Tonight my son bought a CO2 pistol from Wal-Mart for $31 and it says it has a muzzle velocity of 480fps and holds 15 BB's in the magazine. Sounds like that could be a possibility for a vehicle mounted gun. I kind of like the idea of shot filled 22lr, 38's, 9mm's, or 44's myself but the BB pistol may be a cheap, quick, and easy way to get started.
So far things are looking very do-able on this project, plus a lot of fun :-)
RogerN