This is an excellent video documenting some Flock camera vulnerabilities by Benn Jordan, a security hobbyist/researcher: https://www.youtube.com/watch?v=uB0gr7Fh6lY. It's a bit long, but worth it.

His work on this and similar topics is very good, he has deep technical insight and is a good communicator, but it's a bit funny seeing him referred to as a security hobbyist as in my mind he's a musical genius and one of the greatest living US musicians/programmers.

    https://www.youtube.com/watch?v=4_SxlRQhHOA&list=RDZD8N9tDDQT4
    https://www.youtube.com/watch?v=-vzXHhRBLnA&list=RDTgoAgYR4584
    https://www.youtube.com/watch?v=XHCg47cWIUc&list=RDXHCg47cWIUc

Some disucssion on that one: https://news.ycombinator.com/item?id=45945960