Minimal CSS to create background video

background-video.css

/*
 * This method can be applied to video tag and 
 * can be applied to iframe video like youtube, but with some issue to be considered
*/
video{
  /* Centering the video */
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  
  /* Below Props will stretch the video size */
  min-width: 100%; 
  min-height: 100%;
  
  /* Below props will keept the aspect ratio */
  width: auto;
  height: auto;
}