.

I had a camera fitted a few years ago outside my rented flat. If landlord asked it was because I have a dog walker, cleaner regularly and wanted to make sure the right people were coming into my flat at the right times and doing their job etc. Was sort of a lie but The landlord was fine about it and just said make good the area you attached it to outside front door when you leave.
It was only small. It sent screen shots of all movement at front door to mobile device and videod those moments.
I've seen maplins do a newer more modern kit now too.
When I move to a new place for work I'll be installing one.