According to the MLA Style Center:
If the creator's name is clear, the basic MLA format is:
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Author. "Title of Video." YouTube, Publication Date, URL.
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Example: sayerb123. "Husky Puppy Talking Saying 'I Love You'." YouTube, 30 Dec. 2009, youtu.be/N_Qqs0Qw5CE.
If it is not clear who the creator of a video is, start the citation with the title of the video:
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"Title of Video." YouTube, uploaded by Name, Publication Date, URL.
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Example:
"Capybara Meme." YouTube, uploaded by pigeonpartytime, 4 Oct. 2021, youtu.be/OHtyWD2934Q.