Thanks again for your response. Sorry to be away.It's not a lost cause, but it requires adding support for UVC (USB Video Class) cameras into the plugin. Nobody has taken on that project yet. If your camera does not support VISCA, then there isn't anything the release code will be able to do.
The cameras do support VISCA. Also Pelco, RS232 and RS485.
There is no cable connected to the RS232/RS485 port in the back of the camers, though I could with some effort wire it in. Any idea how to tell what protocol is being used to control the cameras from OBS?
I'm not at the location now, but when I get there tomorrow I'll see if the OSD is of any help.