Гаҗәп дөнья!

<br>
<div class="video-responsive">
<style type="text/css">
.video-responsive {
  position: relative;
  padding-bottom: 56.25%; /* задаёт высоту контейнера для 16:9 (если 4:3 — поставьте 75%) */
  height: 0;
  overflow: hidden;
}
.video-responsive iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-width: 0;
  outline-width: 0;
}
</style>
<div class="video-responsive">
<iframe width="560" height="315" src="https://www.youtube.com/embed/ncPVgjyoh2s&quot; frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</div>
 <br>
</div>
<br>