Just for fun I installed a gopro as a 2nd eye, connected to an eagle tree osd and the eagle eyes for google earth live tracking. Running 2 opencv services in the script I can still do the tracking and change eyes left to right or right to left. The eagle eyes has 4 a/v outputs so I can use another screen. Parameters can be changed at the osd, even some sensors could be added.
The gopro is attached with a live-out cable (using video-signal and ground only) and a video-grabber to the notebook.