JSFiddle - React, Tailwind, and code Playground

HTML

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>


<!-- Button trigger modal -->
<a class="btn btn-primary" type="button" data-bs-toggle="modal" data-bs-target="#exampleModal">
  How it works
</a>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">

  <div class="modal-dialog modal-dialog-centered">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="staticBackdropLabel">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      
      
      <div class="modal-body">      
      <iframe id="how-it-works-video" width="100%" height="100%" src="https://www.youtube.com/embed/BrD3abCyuzw" title="YouTube video player" frameborder="5" allowfullscreen></iframe>
      </div>


    </div>
  </div>
</div>

JavaScript

$(document).ready(function() {
  var url = $("#how-it-works-video").attr('src');

  $("#exampleModal").on('hide.bs.modal', function() {
    $("#how-it-works-video").attr('src', '');
		console.log('Unloaded')
  });

  $("#exampleModal").on('shown.bs.modal', function() {
    $("#how-it-works-video").attr('src', url);
		console.log('Loaded')
  });
});