Markup: templates/output/04-elements/videos/mp4.html
<figure class="video">
<div class="video-embed">
<video class="video-embed-item" width="1200" controls="">
<source src="https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4" type="video/mp4"/>
</video>
</div>
</figure>
Source:
assets/sass/04-elements/_elements.videos.scss, line 71