Closed circuit viewing?

At, we don’t have the bandwidth for streaming over the internet. But I’ve been thinking it would be cool to have a movable camera rig set up that could feed a projector at the front of the room. Ideally, I’d be able to combine the videos via a laptop and record the proceedings.

The camera rig stuff is out there, but I’m wondering if anyone can offer advice on how to get the video to a laptop – for example, if there’s a reliable way to do it without wires. Even then, now it’s occurring to me that my laptop has one HDMI port, so I’m not sure how I’d take multiple inputs and then I’m really not sure how I’d still be able to output to a projector.

Anyone have any experience with this kind of thing?