Hello @RL1000
yes you can use rpmfusion repo
check this one Configuration - RPM Fusion
for command line you need
dnf install epel-release
to enable the epel repo
and the following from the link i mentioned
dnf install --nogpgcheck https://mirrors.rpmfusion.org/free/el/rpmfusion-free-release-8.noarch.rpm
dnf install --nogpgcheck https://mirrors.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-8.noarch.rpm
dnf config-manager --enable powertools
dnf groupupdate core
dnf groupupdate multimedia --setop="install_weak_deps=False" --exclude=PackageKit-gstreamer-plugin
dnf groupupdate sound-and-video
hope that help and have a nice day 