This's simple Lazy Youtube module based on iframe video.
- jQuery (3.x or later)
<link rel="stylesheet" href="/path/to/module/css/lazyYT.css" />
<script src="/path/to/module/js/lazyYT.js"></script>
<!-- or -->
<link rel="stylesheet" href="/path/to/module/css/lazyYT.min.css" />
<script src="/path/to/module/js/lazyYT.min.js"></script>
<div class="lazyYT" data-youtube-id="<ID>"></div>