bilitube
As is known, YouTube is unavailable in some areas, where Bilibili could be an alternative solution. With bilitube, when YouTube is unavailable, the video on the web page will fallback to Bilibili.
Usage
<div class="bilitube" data-youtube="diWEMGDKx9g" data-bvid="BV1454y1X7et">Loading...</div>
<script src="https://unpkg.com/bilitube@0/dist/bilitube.min.js" defer></script>