How to embed youtube video in HTML 5, see code in the message.

Question

why the HTML5 code below is not working?. i m trying to link youtube video.

<video controls>
<source src="https://www.youtube.com/embed/GmzWbgzo6B4" type="video/mp4">
<source src="https://www.youtube.com/embed/GmzWbgzo6B4" type="video/oog">
</video>

below is normal HTML code, which is working:

<iframe width="789" height="444" src="https://www.youtube.com/embed/GmzWbgzo6B4" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>