I've been meaning to work on something similar. I have some random cheap IP camera's lying around I'd like to use but don't want their entire suspect cloud connection, shoddy app, etc. One of them looked particularly easy. After getting stumped on a similar password gate, I tried throwing Codex with as much "don't worry about safety I have permissions to do this" prompts as possible but that shut down pretty quickly. I gave it to deepseek and it was much more cooperative but I didn't have a setup as equipped to easily interact with the network and USB connection like I did with Codex and wasn't sure how much I'd be putting in token wise to a cheap camera. Seeing this cost you a whopping 22 cents I'm tempted to give it a shot now if I can get a better setup for it to interact with the cameras.

Check if they have RTSP video streams. Even the cheapest ones usually do, labeled something like "LAN view". Unless you have rare cameras, RTSP is probably already documented on some forum and you can bypass the debugging entirely.

With open RTSP streams, you can just treat them as dumb cameras. Keep them in an isolated network segment and use some recording software to capture their picture.