I did not get this to work with the HACS solution.
But very recently, an HA update added support for Reolink devices (in release 2023.1). That integration works for live video, did not investigate recorded media. But this might be the way to go.
Thanks for your answer. I finally managed to get this going, I was using https on both internal and external access, and apparently Reolink cannot push information over a webhook with https. So after changing this on my ha instance it started working.