Welcome to Dementia Support Frum (previously Dementia Talking Point)
@Gill70.
The question of cameras comes up quite a lot, so I did a search using the search bar at the top and this is what it came up with:
forum.alzheimers.org.uk
Some of the threads will be old so you might not get a reply from the people that posted, but it should give you a bit of an idea of the pros and cons. I never used them with my mother, as I'd got rid of her broadband at about the time they would have been useful.
This is a very friendly and supportive place, and I'm sure people who have used them will be along with their thoughts very shortly.