It's easy, just connect a web camera to the USB port and reboot the controller. The web camera must be compatible with the Raspberry PI. Here is a link describing compatibility of web cameras with the Raspberry PI.
https://elinux.org/RPi_USB_Webcams
Here is a video demonstration of the Buildbotics Controller with remote video working.
https://www.youtube.com/watch?v=nbjZkWGUisU