Yeah there's cameras everywhere. That's kinda the entire concept of Big Brother. The actual show actually has a live feed where viewers can watch what players are doing/talking about in their off time. And I guess it helps viewers understand a lot of the players' strategy and thoughts that might not have ended up in the edited episode. I've never actually watched the show or the live feeds myself, but I've seen a lot of fan discussion to kinda get the jist of it.
Yeah there's cameras everywhere. That's kinda the entire concept of Big Brother. The actual show act