BeagleBone Video through USB and adding overlays with OpenCV

So I have a Logitech C920 streaming video to the BBB. Overlays are then added to the BBB through OpenCV. My question is…how can I take this video (with the overlays)
and write this video to a video-transmitter (sample) to send the data to FPV Goggles? I know it’s not as simple as choosing a GPIO pin and writing to it…right?

Any help would be greatly appreciated.