docs(intro): GuideVideo is not loaded.

[jjangga0214]

Hi!

As you can see in the screenshot, it's not loaded.
The error message(translated) is "Can not find supported MIME type video".

Info

• firefox 103.0.2
• chrome 104.0.5112.101 (arm64)
• macOS Monterey 12.5
• M1 Max

Thanks!