If you don't already have a PC hooked up to each of these TV's for powerpoint presentations or similar, just get a nettop box and vesa-mount it to the back or hide it out of sight.
Windows + webex + webcam = complete VOIP solution for web-based conferencing, screen-sharing, presentations, etc.
Plain old fashioned video-camera-to-video-camera connections are obsolete. We have always had one and it's almost impossible to find a client/consultant anywhere in the world who still uses one - and we deal with several hundred construction firms globally.
It's all web-based now. H.323 based standalone IP camera/codecs from Polycom/Tandberg are dinosaurs with limited use. You can adapt them to work for web-conferencing but they are so limited and overpriced that they will die out before long, I am sure of it.
Since your primary goal is to connect two rooms together, get two HD webcams with great microphones (or run a seperate omni-directional mic to the table), create a couple of free Webex accounts and then you have 30Mbit free VOIP calling, screen-sharing collaboration tools and of course video calls. If you don't have the PC's yet you can get anything but a NUC, OS license and a webcam aren't going to cost much more than $500 each end.]
This is one of our two smallest 6-person meeting rooms; an i5 Win7 PC with a decent 1080p H.264 stereo webcam
We have six dedicated rooms like this all with similar setups and it's rare not to have a Webex or Skype running video to a remote team in at least two rooms at any one time. The Tandberg is in the largest meeting room gathering dust - the thing hasn't been used this year, and it's never been as simple to use as the webcam/web-based options. Our projects are primarily Western Europe, Middle-East, China though we also work in Africa and Russia. We don't have a lot of experience working in the US (because the US office does all of that exclusively). I can't imagine it'd be any different though.