Replaced screenshot by video

index.html

@@ -31,7 +31,7 @@
       experiment with your drone (e.g. during a <a href="http://nodecopter.com/">nodecopter event</a>).</p>
 
       <div class="screenshot">
-          <img src="images/screenshot.png">
+        <iframe width="560" height="315" src="http://www.youtube.com/embed/CF4SlwLkIaU" frameborder="0" allowfullscreen></iframe> 
       </div>
 
 <h2>Built-in plugins</h2>