Update create-a-voice-virtual-assistant.mdx

Author: jules-kris

projects/create-a-voice-virtual-assistant/create-a-voice-virtual-assistant.mdx

@@ -50,13 +50,12 @@ The final assistant will:
 
 Here is a sneak peek of the final assistant in action:
 
-<iframe
-  width="315"
-  height="560"
-  src="https://i.imgur.com/83XuIPB.mp4"
-  title="video player"
-  allowFullScreen
-></iframe>
+<p align="center">
+    <video width="1280" height="480" controls>
+        <source src="media/demo.mp4" type="video/mp4">
+    </video>
+</p>
+
 Let's dive in!
 
 ## Setting Up the Environment