PSP homebrew dev art has released a quick demo showing an inverted color output from the PSP GoCam accessory in real time. That's it. It does nothing else. Here's what Art has to say about it:
Here's a demo that shows colour inverted output from the GoCam on the PSP screen in real time. based on the Chotto cam sample at ps2dev.org. It does nothing else, no saving of photo or video, just an experiment done with the same sample I started on for Laser Invaders.