Fiverr Editors will usually add a new service with a video straight to the ‘Recommended’ section of a category. This may not always be the case but speaking from personal experience.
Speaking as a buyer, I’ve only looked at two videos on Fiverr gigs, and both were for video-related gigs. Some of the non-video gigs I’ve purchased had videos on the gig page, but I didn’t watch them.
No idea whether it makes a difference to Fiverr’s search results, though. If it does, I imagine it would be worthwhile to add one.
Reply to @lushdesigner00: Advertising your own gigs is not allowed in this forum section! Get familiar with the Forum Rules.
Reply to @sergio_yanes: It also helps buyers who are too lazy to read a gig description. Thanks for mentioning me.