Bulk Delete Recordings

Welcome to the Zoom Community, @Raminator.

Depends on what you consider “bulk-deletion”. See this Zoom Support article for the current recommendation:

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0066493#h_01EG72AYMTVJ4AB7FK273H7HXKZ
Note that this article has been recently revised. As with any delete operation, I recommend testing it on a small sample. Anything that is “trashed” inadvertently should be immediately recoverable from the Trash area. 

As for an API, you can certainly write your own process to export a list of files, remove any filenames you want to keep, and run them back through a deletion process. My opinion: Probably not worth the effort if this is a one time process, unless you’re an API wizard.