Apply `object-fit: cover` to the `<video/>` element

Currently, there does not seem to be a solution for filling the whole player viewport with the video provided (known as `cover`). The `` element cannot be styled since it's loaded in the ``.

Start by locating the component or entry point that renders the iframe and checking the existing player and styling options. Verify whether the embedded video element can be controlled from this package; done means the player can fill its viewport using cover behavior, with the relevant behavior covered by an existing or newly located test.

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