talos: enable v4l2 virtual camera module

hosts/talos/default.nix

@@ -16,10 +16,16 @@
     ./secrets.nix
   ];
 
-  boot.kernelPackages = pkgs.linuxPackages_6_10;
+  boot.kernelPackages = pkgs.linuxPackages_6_11;
   # Set Wi-Fi regulatory domain. Currently always set to '00' (world), and could
   # lead to bad Wi-Fi performance
   boot.kernelParams = ["cfg80211.ieee80211_regdom=FR"];
+  boot.extraModulePackages = with config.boot.kernelPackages; [
+    v4l2loopback
+  ];
+  boot.extraModprobeConfig = ''
+    options v4l2loopback devices=1 video_nr=1 card_label="OBS Cam" exclusive_caps=1
+  '';
 
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot = {