Not able to answer that question but the Auskunftspflicht also covers police surveillance footage.

Personal anecdote: I was involved in a student demonstration once that ended with the police recording every individual separately in addition to checking our national ID cards. After about 14 days I wrote them a letter requesting information about what data they had kept and to destroy that data if it is not part of an active investigation.

I received a formal response saying they had already destroyed the data shortly after collecting it because they didn't end up needing it.

I presume the law is exactly the same as with any other organisation, i.e. the BDSG (Bundesdatenschutzgesetz) which as of now implements the GDPR (DSGVO) in Germany.