100% of those cases would be favorable to cops. Defamation laws are quite restrictive in Europe, much more so when it involves public officials (take a look at the Strafgesetzbuch)
If you really want to generalise across the continent, the most common scenario would be that you're completely within your right to film them and publish that, but then the cops would argue (using GDPR of all things) that you have to blur their faces and names before publishing. (Try to argue != succeeding automatically, that's up to the court to decide.)