Update index.html

public/home/index.html

@@ -64,6 +64,8 @@
     <h1>Demo</h1>
 
     <p>
+      <img src="ezgif.com-gif-maker.gif" alt="video demonstration"  width=60%/>
+      <br></br>
       More about the development of the application can be found in the following repository:
       <br></br>
       <a href="https://transfer.hft-stuttgart.de/gitlab/huijustinjing/ar-building-visualization-with-grayscale-filter"> Application Developement Repository</a>