I use the Real video link in my 3rd project but the video is not displayed

I use the Real video link in my 3rd project but the video is not displayed.
here is my code.https://codepen.io/solomon123fgt/pen/VwLWGYO?editors=1100

You can’t point the src at a stream like that. Technically you can get the actual file being played and use that (under the network tab in the dev tools) but it is a very long and ugly URL with a bunch of info in it (including the client IP address).

Use the Embed function of YouTube instead. Click the Share button, click Embed and copy the code. Make the video responsive (here is a site that can help).