The community member who posted the original post is wondering why there is a Vimeo Component but no YouTube one. In the comments, another community member suggests that the user can add custom HTML to achieve the desired effect, and expresses confidence that the Webstudio team will eventually add native support for YouTube, but for now recommends using iFrames.
You can always add custom HTML to get the effect. I'm positive the Webstudio team will eventually get around to doing it natively but for now just use iFrames.