I bet it's done using something like this https://www.amazon.com/HDMI-Cloner-need-Capture-streaming-videos/dp/B00TF9MCXU/ref=pd_zg_rss_ts_e_6795230011_5 https:

I bet it's done using something like this https://www.amazon.com/HDMI-Cloner-need-Capture-streaming-videos/dp/B00TF9MCXU/ref=pd_zg_rss_ts_e_6795230011_5 https://www.amazon.com/HDMI-Cloner-need-Capture-streaming-vi... or, in a world where such devices are outlawed, you could take the outputs of the LCD matrix controller and convert the signals meant for the physical pixels to a video stream :)