JSFiddle - React, Tailwind, and code Playground

HTML

<iframe width="420" height="315" src="//www.youtube.com/embed/OuSdU8tbcHY" frameborder="0" allowfullscreen></iframe>
<button>Play</button>

JavaScript

$('button').on("click",function(){
    $('iframe').attr("src", "//www.youtube.com/embed/OuSdU8tbcHY?autoplay=1");
});