extract obs kernel module

system-modules/obs.nix

@@ -0,0 +1,7 @@
+{ config, pkgs, ... }@all: with all; {
+  boot = {
+    extraModulePackages = with config.boot.kernelPackages; [ v4l2loopback ];
+    kernelModules = [ "v4l2loopback" ];
+    extraModprobeConfig = ''options v4l2loopback devices=1 video_nr=1 card_label="OBS Cam" exclusive_caps=1'';
+  };
+}