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.
<div class="bilitube" data-youtube="diWEMGDKx9g" data-bvid="BV1454y1X7et">Loading...</div>
<script src="https://unpkg.com/bilitube@0/dist/bilitube.min.js" defer></script>