Re: yet another idea for the video tag.

This is already possible.

You can use a kind=metadata WebVTT track and put your arrow in SVG. Then
you just write a small JavaScript program to take the content of the WebVTT
cue and give it to the Web page as html (see getCueAsHTML function in [1]).

Alternatively you can also just use a UTF-8 character for "arrow" and
position it through a WebVTT cue.

Cheers,
Silvia.

[1]
http://www.w3.org/html/wg/drafts/html/master/single-page.html#texttrackcue

On Sun, Feb 3, 2013 at 5:27 AM, GIDEON ISAAC
<mad.gideon.isaac@hotmail.com>wrote:

>  The video tag specification allows comments to be made, that then show up
> as subtitles on the video.  Here is another idea.  Lets suppose that I'm a
> teacher of some subject, and I want to add comments to someone elses video
> (maybe a students) and on top of that, I want to show an arrow on the
> video, that points to a specific item on the picture.  Rather than edit the
> video with some video-editing software, it would be great if I could
> specify an x-coordinate, a y-coordinate, and an arrow direction that would
> overlay the video at a certain position in the video, for a certain time.
> -- Thanks,
> Gideon
>