JSFiddle - React, Tailwind, and code Playground

HTML

<video controls autoplay>
  <source src="https://www.w3schools.com/tags/movie.mp4" type="video/mp4">
</video>

JavaScript

$(document).ready(function(){
  var screenWidth = $(window).width();
  if (screenWidth < 800){
		$('video').removeAttr('autoplay');
  } else {
  	$('video').attr('autoplay');
  }
});