The all-seeing eye? How surveillance and facial recognition works

In Moscow, surveillance cameras with a facial recognition system are widely used, actively used for surveillance and detainee, including those who do not want to serve. The history of the development of this system, its technical features, as well as the legal aspects of its use and the possibility of protection against it are told. And also how exactly this technology works, why it is not always legal, and whether there are ways to avoid getting into the field of view of cameras.