There is a case where a movie box may have space around the component if you place the box as it is.

You can adjust the space by configuring an iframe with 200% width and 110vh height.

However, space would still emerge when you stretch the iframe's width larger to a certain extent. You might be able to mitigate this behavior by enlarging the width wider than 110vh.

(The displayed movie will be larger as you increase the width as a result)

The behavior of the background movie depends on Youtube and Vimeo's specifications. Therefore the space around the movie box may not be fully adjustable when the box is larger than a certain size.

Related Article