Trouble getting quicksync to work with jellyfin

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I came here searching for the fix to error: Failed to initialize MFX error I encountered when trying to use hardware-accelerated recording with OBS.

On 24.05, all I needed is to add onevpl-intel-gpu to hardware.opengl.extraPackages:

  hardware.opengl = {
    enable = true;
    extraPackages = with pkgs; [
      # https://nixos.wiki/wiki/Accelerated_Video_Playback
      intel-media-driver # LIBVA_DRIVER_NAME=iHD
      libvdpau-va-gl
      # OpenCL filter support (hardware tonemapping and subtitle burn-in)
      intel-compute-runtime 
      # To make OBS HW recording work
      # https://discourse.nixos.org/t/trouble-getting-quicksync-to-work-with-jellyfin/42275
      onevpl-intel-gpu
    ];
  };
  environment.sessionVariables = { LIBVA_DRIVER_NAME = "iHD"; }; # Force intel-media-driver

Thank you for the hint!