Merge pull request #24801 from theartful:better_error_msg

Better error message for missing gstreamer plugin

modules/videoio/src/cap_gstreamer.cpp

@@ -2820,7 +2820,8 @@ void handleMessage(GstElement * pipeline)
 
         if (gst_is_missing_plugin_message(msg))
         {
-            CV_WARN("your GStreamer installation is missing a required plugin");
+            CV_WARN("your GStreamer installation is missing a required plugin: " <<
+                    gst_missing_plugin_message_get_description(msg));
         }
         else
         {