If you were meaning putting YT videos on your post - that means diversifying your post with various types of content with the goal of making the visitor to stick longer on your website, and reduce bounce rate in the process - then, yes, putting YT videos can definitely help your site in that aspect -just make sure that your site isn't spammy.
If you were meaning putting a link on a YT video (the YT page) - this does not pass link juice as the links are no follow, but having that video there help you build a brand for your website instead, which is also good in the long term, but not immediate term.