JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="yt_id" name="videourl" value="_g-dyXWUov8" style="width:400px;" />
<!--<iframe id="myIframe" width="230" height="129" src="https://www.youtube.com/embed/_g-dyXWUov8?rel=0&amp;showinfo=0" frameborder="0" allowfullscreen></iframe>-->

<iframe id="myIframe" width="230" height="129" src="https://www.youtube.com/embed/Q1rhoq77dcY" frameborder="0" allowfullscreen></iframe>

JavaScript

$(document).ready(function(){
   $('#yt_id').on('input', function() {
      $("#myIframe").attr("src","https://www.youtube.com/embed/"+$('#yt_id').val()+"?rel=0&amp;showinfo=0");
   });
 });