Please branch and build frei0r-plugins in epel9. If you do not wish to maintain frei0r-plugins in epel9, or do not think you will be able to do this in a timely manner, the EPEL Packagers SIG would be happy to be a co-maintainer of the package; please add the epel-packagers-sig group through https://src.fedoraproject.org/rpms/frei0r-plugins/addgroup and grant it commit access, or collaborator access on epel* branches.
Now that opencv and gavl are in EPEL 9, it should be possible to build this now. Could you please do so?
FEDORA-EPEL-2022-3616206eda has been submitted as an update to Fedora EPEL 9. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2022-3616206eda
FEDORA-EPEL-2022-3616206eda has been pushed to the Fedora EPEL 9 stable repository. If problem still persists, please make note of it in this bug report.