Cannot add user to group "video" and make it persist;

I am trying to enable hardware acceleration for my Jellyfin media server with Nvidia GPU however I am running into weird issue where no matter what I do, the group doesn't get assigned - reboot or relog do nothing:

spasoff@bazzite:~$ sudo usermod -aG video spasoff
spasoff@bazzite:~$ ls -l /dev/nvidia-caps
ls: cannot open directory '/dev/nvidia-caps': Permission denied
spasoff@bazzite:~$ ujust add-user-to-input-group
spasoff@bazzite:~$ groups
spasoff wheel docker
spasoff@bazzite:~$
spasoff@bazzite:~$ ujust add-user-to-input-group spasoff
error: Justfile does not contain recipe spasoff
spasoff@bazzite:~$ groups spasoff
spasoff : spasoff wheel input docker

Am I missing something? Is the syntax wrong or is there another way to do that?
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