add demo videos, test=doc

docs/source/demo_video.rst

+Demo Video 
+==================
+
+.. raw:: html
+    
+    <video controls width="1024">
+
+    <source src="https://paddlespeech.bj.bcebos.com/Parakeet/docs/demos/PaddleSpeech_Demo.mp4"
+            type="video/mp4">
+
+    Sorry, your browser doesn't support embedded videos.
+    </video>
+

docs/source/index.rst

@@ -41,6 +41,7 @@ Contents
    tts/gan_vocoder
    tts/demo
    tts/demo_2
+   tts/demo_video
 
 .. toctree::
    :maxdepth: 1
@@ -48,6 +49,13 @@ Contents
 
    released_model
 
+.. toctree::
+   :maxdepth: 1
+   :caption: Demo Video
+
+   demo_video
+
+
 .. toctree::
    :maxdepth: 1
    :caption: Acknowledgement

docs/source/tts/demo_video.rst

+TTS Demo Video
+==================
+
+.. raw:: html
+     
+    <video controls width="1024">
+
+    <source src="https://paddlespeech.bj.bcebos.com/Parakeet/docs/demos/paddle2021_with_me.mp4"
+            type="video/mp4">
+    Sorry, your browser doesn't support embedded videos.
+    </video>
+