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Slideshow background adds a full size, smooth transition slideshow to the background of a WordPress site. Images can be selected from the media library or uploaded via drag-and-drop. Every page load will begin at a random position in the image loop so that users are not presented with the same start image every page change.
Additionally, the images maintain their aspects ratios during resize and turn off for mobile users.
This plug-in was conjured up by a nerd at <a href="http://think-bowl.com/" title="It's less of a tank and more of a bowl." rel="nofollow ugc">Think Bowl</a>

Simple Slideshow Background

Display a full size slideshow in the background featuring images from the media library.

Parallax, Image and Video Backgrounds Plugin For WordPress 
★★★★★
Create any type of backgrounds using advanced block settings. We created <a href="https://wpbackgrounds.com/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=head" rel="nofollow ugc">Advanced WordPress Backgrounds plugin</a> to insert the Youtube and Image Parallax backgrounds with a few clicks on block sites of our clients.
<a href="https://wpbackgrounds.com/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=head" rel="nofollow ugc">See Live Demo</a> | <a href="https://wpbackgrounds.com/docs/getting-started/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=head" rel="nofollow ugc">Documentation</a> | <a href="https://github.com/nk-crew/awb/" rel="nofollow ugc">GitHub</a>
<h3>Features</h3>
<ul>
<li>Background Types:
<ul>
<li>Color</li>
<li>Image</li>
<li>Post Featured Image</li>
<li>Pattern images</li>
<li>Self Hosted Video</li>
<li>Youtube / Vimeo Video</li>
</ul>
</li>
<li>Parallax options powered by high performance JavaScript plugin <a href="https://github.com/nk-o/jarallax/" rel="nofollow ugc">Jarallax</a>
<ul>
<li>Custom speed option</li>
<li>Enable / Disable for mobile devices option</li>
<li>Scroll effect</li>
<li>Opacity effect</li>
<li>Scale effect</li>
<li>Scroll + Opacity effect</li>
<li>Scroll + Scale effect</li>
</ul>
</li>
<li>Mouse Parallax</li>
<li>Custom video start & end time</li>
<li>srcset supported (i.e. Google love it)</li>
<li>Overlay color with transparency options</li>
<li>Gutenberg block supported</li>
<li>WPBakery Page Builder supported (extended row and col options + separate shortcode)</li>
<li>Custom CSS offsets (paddings + margins)</li>
</ul>

Advanced WordPress Backgrounds

Best parallax plug

Best way to add video bkg self hosted to WP Bakery


My theme comes with Jarallax. AWB is the perfect addition to actually take advantage of it.


Perfect addition for Jarallax

Easy to use advanced Parallax, Image and Video backgrounds block plugin with parallax and video support.

Simple Slideshow Background vs Advanced WordPress Backgrounds