If memory serves me right, here in Ohio, that you only need to have one party with knowledge of the recording, and if that's me, then that's the one party. Funny how people around me know that I'm always tinkering with ways to show them how their privacy can be invaded, so they are careful to say things around me for fear that I might mangle it in a mashup and send it to them in a video or audio file. Honestly though, so many of them didn't realize that companies can turn on their web cam and audio recording while their working, or how someone with one of these phones can broadcast EVERYTHING to the web and all by just walking around and using 4G.
Being a walking social experiment is one thing, but being a law suit waitng to happen is another. Check your local laws about recording video that has embedded auido, and audio by itself. It's the audio that gets you in trouble more times than not.