In this article I will explain with an example, how to play (embed) YouTube Videos using IFRAME with AutoPlay in HTML Page.
 
 
Play (Embed) YouTube Videos using IFRAME with AutoPlay in HTML Page
The following HTML Markup consists of an HTML TextBox, a Button and an IFRAME element.
The Button has been assigned a jQuery click event handler. When the Button is clicked, first the YouTube Video URL is fetched from the TextBox and then YouTube Video ID is extracted from the URL.
The extracted YouTube Video ID is appended to the YouTube embed video URL and the URL is set to the SRC property of the HTML IFRAME element.
For AutoPlay, an additional parameter autoplay=1 is must be appended to the YouTube embed video URL.
<input type="text" id="txtUrl" style="width: 300px" />
<input type="button" id="btnPlay" value="Play" />
<hr />
<iframe id="video" width="420" height="315" frameborder="0" style="display: none"
    allowfullscreen></iframe>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $("body").on("click", "#btnPlay", function () {
        var url = $("#txtUrl").val();
        url = url.split('v=')[1];
        $("#video")[0].src = "https://www.youtube.com/embed/" + url + "?autoplay=1";
        $("#video").show();
    });
</script>
 
 

Screenshot
Play (Embed) YouTube Videos using IFRAME with AutoPlay in HTML Page
 
 
Demo
 
 
Downloads