...it’s not a crime in Tennessee to film fully clothed women without their consent if they’re in public.
However, “how” you film may be a problem. e.g. stalking or “up the skirt”, etc. But yeah. It sorta hast to be legal or all photography where people are around could come under legal scrutiny. You couldn’t even take a picture of your family without worrying about who or what is in the background. And just one slip up could cost you. And things like Google Glass or the equivalent will eventually be so common people won’t even think about it.
In this case, the guy was getting up real close to the women and filming.