Hi Chris, My school has a few Swivls that we have used. We've used for recording student presentations to teacher recording their lessons. I would say that the only hamper to the Swivls are that the mics sometimes not so great to record the kids' voices. Nevertheless, its a great device to get a panoramic view of the lesson. I would say even planting the camera in one spot can be very powerful for a GHO. In some classrooms kids sit at their seats for a long period of time.
To answer some of your questions about the Google + community. As I understand, Google + operates in circles that can be privately shared. Therefore a school can set up a "circle" to only stream to members in their own community. That would not be hard to set up, as our school does that. Secondly, recording can be done with Google on Air, which saves into the Youtube channel. There may be a way to make that recorded video private. However, another suggestion might be screen video lesson. Finally, a device like http://www.swivl.com/product/#top might be helpful to move the camera with the speaker. Nevertheless even a camera planted just at the corner of the room can be beneficial. Our school is currently prototyping some of these ideas and testing it out in January 2016. Because our school uses Google accounts, the workflow process might be easier. We are using Google Calendars for teachers to book times for observations. We also have four swivls for teachers to borrow. Finally we are considering using Google Forms (linked to QR-Codes) for teachers to give feedback after the lesson. I've seen a couple of our teachers' use Google Hangouts to showcase their lessons. Because these were innovative teachers, watching their classrooms virtually was powerful learning for me.