animateTransform the video element
animateTransform is applied to g with a partly transparent
yellow rectangle and a video element with transformBehavior pinned90.
This means, the video is not transformed
For a comparison a red rectangle is provided
The format used for the video is an application/ogg.
Because it is not required to support this format, at least
the light blue viewport has to cover the red rectangle,
if the application/ogg itself is not displayed.
Red indicates an error.
requiredFormats application/ogg not supported