Money has gone missing from home safe – Need advice on interior camera

I’m sorry if this isn’t protocol. If I’m posting in the wrong sub just let me know.

With that said, I need some advice on an interior surveillance system as quite a lot of cash has gone missing from a home safe. I need to know who’s taking it for certain before I contact the authorities.

I’m looking for a small camera that can be hidden under something like clothing or a hat, and that saves video to the cloud for later viewing. I looked at thermal activation cameras too but all of this is going over my head a bit.

I hope that’s enough information. I’m in the UK, and my price range is £50-£150.

Thank you.