embed HTML5?

Is it possible on this board? I've seen mentions elsewhere of [H5LOOP] and [H5VIDEO] tags to accomplish it, but they don't seem to work here.

No, that is not allowed here.

Perhaps you can create the media, embed it somewhere else and create a link to that here.

The only allowable way to embed videos here is to host them on Youtube. Then you can do the following.

Embedding Youtube videos

[YOUTUBE]YoutubeID[/YOUTUBE]
[YOUTUBEHD]YoutubeID[/YOUTUBEHD]

Where YoutubeID is the Youtube View ID.