Getting WebCam Video Out of BBB


I have a Logitech C920 USB Camera feeding video to an OpenCV program on BBB. The OpenCV program adds overlays to the video. My question is, how can I take the modified
video and write it to a video transmitter (sample) - to send to FPV Goggles? It can’t be as simple as writing to a GPIO pin right? This newb is stumped.

Any help would be greatly appreciated.