Just this week I've been taking walks in my neighborhood, and the number of homes that chime or play a voice recording to indicate being recorded was shocking. I just indicate to them that I think they are number 1. In other situations where I'm in public with a camera cleary pointed in my direction I tend to do that with my hand in front of my face. If they are going to blur out the #1 sign, my face gets conveniently blurred as well. They might have a right to record, but I also have a right to silently express my opinion as well.