Cool, I haven’t looked into pixel-buffer access much.
Having iGlasses be a useful server would be great – publishing your frames the right way up shouldn’t be too difficult. SyphonServer is Key-Value-Observable for hasClients, so if you register for notifications for that using the standard KVO mechanism you could switch on/off the camera whenever that toggles.
I think a lot of people would be excited to see a Syphon-to-video-device bridge.