"start" optional parameter for video embeds

[maxime-michel]

I'd like to be able to start a video at a certain timestamp through an optional parameter, named start for instance. Both Vimeo and YouTube embed options allow this by adding a parameter such as t=1m2s.

I can submit a PR but I'm not sure if this is a common need. Any thoughts?

[mmistakes]

To avoid further complicating things, not sure this is necessary. The time start is part of the video's URL. Couldn't you just append that to the video id and do something like this?

{% include video id="XsxDH4HcOWA?start=35" provider="youtube" %}

Perhaps just an update to the documentation to note that an id can contain the start time from a YouTube embed.

[maxime-michel]

Excellent idea, that works great, thanks a lot. I'll open a PR to have it mentioned it in the docs.