We just used the OV2640 module itself (https://www.aliexpress.com/i/4000036275403.html https://www.aliexpress.com/i/4000036275403.html) which is pretty small. W

We just used the OV2640 module itself (https://www.aliexpress.com/i/4000036275403.html https://www.aliexpress.com/i/4000036275403.html) which is pretty small. While we didn't actually include a little battery and perhaps something like an ESP-32 to control it, I'm pretty sure those could fit inside the plug if hollowed out.