I don't understand why public is considered "lack a reasonable expectation of privacy".
In Switzerland this only applies if you are in public at a large gathering or event where the use of cameras etc. is expected. In any other situation in public, if you single out a specific person (even if their face is not visible but they are identifiable by clothing/tattoo or vehicle registration etc.) in a video you are violating their privacy and are required to get consent. This consent can also be revoked at any time later.
In Switzerland this only applies if you are in public at a large gathering or event where the use of cameras etc. is expected. In any other situation in public, if you single out a specific person (even if their face is not visible but they are identifiable by clothing/tattoo or vehicle registration etc.) in a video you are violating their privacy and are required to get consent. This consent can also be revoked at any time later.