Been considering something like that to deal with the Suburbans around here that barely acknowledge my existence, even when I’m near the middle of a lane.
I have a mid range gopro type one facing back, attached to the bike and a cheap and cheerful one attached to my lid - https://www.amazon.co.uk/dp/B0CBQ2DFG4 The helmet one is lightweight so it's not annoying, and the rear one has a decent quality picture to capture the vehicle's plate. In the UK, you need a rear facing one which shows the position of the bike in order to report a close pass.
I’ve got a gopro 2024 that attaches to my helmet’s visor. I just say gopro start recording and it starts.
I have a mid range gopro type one facing back, attached to the bike and a cheap and cheerful one attached to my lid - https://www.amazon.co.uk/dp/B0CBQ2DFG4 The helmet one is lightweight so it's not annoying, and the rear one has a decent quality picture to capture the vehicle's plate. In the UK, you need a rear facing one which shows the position of the bike in order to report a close pass.
https://www.amazon.co.uk/AKASO-Camcorder-Waterproof-Rechargeable-Accessories/dp/B01HPXH29Q/522-8309223-0966327
That's the one I have on the back. I think.