I had a question too.
I asked for anything at any price that did this. I didn't ask but you need to define "live" video. Part of my work has been and still is CCTV systems (product design, not in sales or installation) and what you are looking for is usually in your machine vision category and easily can jump in to the 5 figure range.
If you can find an example product that fit your spec at any price it would help others look for other solutions.
http://www.breezesys.com/ for example lets us do a lot with off the shelf DSLRs.