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Where are you suggesting to add this? If the video is added in "Images And Videos" on the product edit form in the admin, where would this be updated? It seems like you are thinking this is added in the description or something
Sorry, this still does not make sense, if I try and add embed code into the URL is does not work: i.sstatic.net/IIfgK.png as image shows I get: Attention Error: "Invalid video url" - where is the URL field you are talking about?
Checked, I just do not see this "Embed" field and changing the Url to add query params (instead of added embed code) has no effect of starting video automatically on product page