Description of problem:
the obs-studio package doesn't include development headers/related files, so it is impossible to compile additional plugins like e.g https://github.com/CatxFish/obs-v4l2sink

They are explicitly removed in the spec file:

# We don't need (a priori) the devel files
rm -rf %{buildroot}%{_libdir}/*.so
rm -rf %{buildroot}%{_libdir}/cmake
rm -rf %{buildroot}%{_prefix}/lib/pkgconfig
rm -rf %{buildroot}%{_includedir}


with a comment of 
* Thu Apr 18 2019 daviddavid <daviddavid> 23.1.0-3.mga7
+ Revision: 1393235
- do not install unwanted pkgconfig file (this prevent pulling some devel stuff)

That I don't really understand - as how would installing pkginfo file cause additional dependencies? Esp. when devel stuff is (typically) in a separate package anyway?