nixos/system/hardware.nix

{ config, pkgs, ... }:
{
  environment.sessionVariables = { LIBVA_DRIVER_NAME = "nvidia"; };

   nixpkgs.config.packageOverrides = pkgs: {
    intel-vaapi-driver = pkgs.intel-vaapi-driver.override { enableHybridCodec = true; };
  };
  hardware = {
    enableRedistributableFirmware = true;
    cpu.intel.updateMicrocode = true;
    graphics =
      {
        enable = true;
        enable32Bit = true;
        extraPackages = with pkgs; [
          vaapiVdpau
          mangohud
          nvidia-vaapi-driver
           intel-media-driver
           intel-vaapi-driver
           libvdpau-va-gl
        ];
        extraPackages32 = with pkgs.pkgsi686Linux; [
          mangohud
            intel-media-driver
            intel-vaapi-driver
        ];

      };
    nvidia = {
      modesetting.enable = true;
      powerManagement.enable = false;
      powerManagement.finegrained = false;
      open = true;
      nvidiaSettings = true;
      package = config.boot.kernelPackages.nvidiaPackages.beta;
    };
  };
}