Add display to show what's being shown/recorded

Command written in terminal to bring up mirror screen of what is being recorded/streamed by the user.

Resolves: #38

advanced/streaming/standard_introduction.rst

@@ -10,6 +10,20 @@ We use the ``access`` parameter of the ``std`` module to specify weather the out
  + Streamed over the network (``access=http``, or ``access=udp``, etc.)
 
 
+
+.. _add-diplay-to-show-what-is-streamed:
+
+**********************************************
+Add display to show what is streamed/recorded
+**********************************************
+
+To view what is being streamed/recorded at the same time of the streaming/recording run the following command in the terminal:
+
+.. code-block :: 
+   
+  $ vlc dshow:// :dshow-vdev="myWebcam" :dshow-adev :live-caching=300 --sout="#duplicate{dst=display,dst=transcode{vcodec=h264,vb=512}}:std{access=file,dst=foo/sample_file.mp4}"
+
+
 .. _save-file-locally:
 
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