Summary

Fixes #3463

After the refactor #3412 video upload was broken. This was because the component was expecting the mediaUpload function to be loaded on the page. This issue was found and patched upstream WordPress/gutenberg#15548 . The fix is simple, just use useSelect to get mediaUpload using a select. This is basically a copy and paste what is found in gutenberg.

Checklist

• My pull request is addressing an open issue (please create one otherwise).
• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).