Maybe make it illegal to publish a video of someone without their consent.
First that you can't attest who filmed something without a lot of effort that law enforcement for sure won't bother with.
In many countries caught doing such activities in public spaces falls under public indecent exposure, if not something more draconian that puts you on a sex offender list. Morally people will feel obliged to report it there.
For example if you post it to Instagram or YouTube they'd know it was you, and you could go to jail.