[FEATURE] Support for self-hosted videos in media content elements

# Feature Request

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The issue names self-hosted videos in media content elements but provides no files, tests, entry points, implementation details, or acceptance criteria. First locate the media content element implementation in the repository and clarify the intended behavior with maintainers; the work is done only when the supported self-hosted video behavior and its expected coverage are defined.

Written by the indexing model from the issue text.