surf: enable audio & video support

pkgs/applications/networking/browsers/surf/default.nix

···
 { lib, stdenv, fetchgit
 , pkg-config, wrapGAppsHook
 , glib, gcr, glib-networking, gsettings-desktop-schemas, gtk, libsoup, webkitgtk
-, xorg, dmenu, findutils, gnused, coreutils
+, xorg, dmenu, findutils, gnused, coreutils, gst_all_1
 , patches ? null
 }:
 
···
   };
 
   nativeBuildInputs = [ pkg-config wrapGAppsHook ];
-  buildInputs = [ glib gcr glib-networking gsettings-desktop-schemas gtk libsoup webkitgtk ];
+  buildInputs = [
+    glib
+    gcr
+    glib-networking
+    gsettings-desktop-schemas
+    gtk
+    libsoup
+    webkitgtk
+  ] ++ (with gst_all_1; [
+    # Audio & video support for webkitgtk WebView
+    gstreamer
+    gst-plugins-base
+    gst-plugins-good
+    gst-plugins-bad
+  ]);
 
   inherit patches;