<video slot="media" src="<https://stream.mux.com/A3VXy02VoUinw01pwyomEO3bHnG4P32xzV7u1j1FSzjNg/high.mp4>" crossorigin>
<track label="thumbnails" default kind="metadata" src="<https://image.mux.com/A3VXy02VoUinw01pwyomEO3bHnG4P32xzV7u1j1FSzjNg/storyboard.vtt>">
</video>
src에서 주소를 가져오는 부분이 있음
썸네일 내용 (아마 정적영상에 한함)