There is no way to say what plugin is used for that based on a video. If you had the link to the actual site we might be able to see that by looking at the site’s source code, but there’s no way to do that with a video.
Also, you’re posting in the support forums for the hosting provider, WordPress.com, which is not the same thing as the open source WordPress software for which plugins like that are made. The forums for the open source software can be found at https://wordpress.org/support/forums/
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