This is a pic from some gov website in China, and it's about people go across road when there were red lights. The monitors are watching on these people and comparing there face IDs with the database, therefore to tell who were them.
It is somewhat helpful to regulate the society, but these data are also easy to be accessed and used by many irrelevant people also. That's also one of the main reasons for uploading people's data and authentication on the blockchain, which will help people manage these data secure and privately.