For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:petertr:branches:home:Kieltux:tools/openSUSE_Tumbleweed/home:petertr:branches:home:Kieltux:tools.repo
zypper refresh
zypper install ffnvcodec
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:petertr:branches:home:Kieltux:tools/15.6/home:petertr:branches:home:Kieltux:tools.repo
zypper refresh
zypper install ffnvcodec
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:petertr:branches:home:Kieltux:tools/15.5/home:petertr:branches:home:Kieltux:tools.repo
zypper refresh
zypper install ffnvcodec