adding some video block attributes

[Borda]

Would it be possible to add some extra attributes to the video block, for example, we are using:

<video 
	width="50%"
	max-width="400px"
	controls
	poster="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/pl_docs/trainer_flags/thumb/check_val_every_n_epoch.jpg"
	src="https://pl-bolts-doc-images.s3.us-east-2.amazonaws.com/pl_docs/trainer_flags/check_val_every_n_epoch.mp4"
></video>

as this is not obvious from the readme and it would help us with Lightning-AI/pytorch-lightning#17941 (comment)

[Borda]

UPDATE: it seems most of them are there:

video/sphinxcontrib/video.py

Line 28 in 0c5d54c

SUPPORTED_OPTIONS: List[str] = [

so maybe just update the readme with a rich example?