Public security cameras are not widely deployed, like, at all. However the police state in Vietnam (the current president came from the same position Putin held before presidency) has adopt this amusing practice of showing up & demanding security footage from private houses' cameras facing the street (which, turns out to cover much more than surveillance cams could ever).
More insane is them also passing a law that forbid usages of the same footages for citizen journalism purposes. This came out after someone posted a footage from their home cam recording that controversial accident when a congressman hit and kill a high-schooler unprosecuted. You can look it up.