We don't do that on my unit. The only cameras are outside the unit so we can see who wants to come in when they ring the doorbell.
Actively suicidal patients have someone with them at all times (except when in the toilet). Room doors don't lock, but doors to the toilet do...but every nurse has keys in case of a problem.
At night (which is when I work) we do bedchecks each 30 minutes for all patients except those who are actively suicidal (those folks have to sleep where we can see them all night long -- not too great on our unit, it means the bed is moved out into the hall at night which makes it hard for the person to sleep because of the lights). Bedchecks means we come by with a flashlight and make sure everyone is asleep and OK.
I think there would be terrible hygiene problems on the unit if there were cameras in the toilet or rooms -- I know I wouldn't be showering or changing clothes!!
So even though I am in the US, I think it is very unlikely you'll be on TV when in your room.