@hk How are you streaming the picture of the camera? I’ve got a bunch of them lying around, and I’d love to be able use one as a webcam! Only thing I’ve seen that does it is this thing, which sticks right out of the Gameboy, so I can see you’re not using that! https://there.oughta.be/a/game-boy-capture-cartridge
@Jonic
I use a cheap (10€) HDMI to USB video grabber and a HDMI-Output conversion kit for the Gamboy Advance. There are kits for most consoles.
Gameboy Camera -> Gameboy Advance -> HDMI -> USB -> /dev/video0
I also recently saw a post on hackaday that did it with a microcontroller, IIRC. Those are probably just grabbing the raw analog signal from the Camera, though. So no on-screen user Interface.