Details about oEmbed - and http://oembed.com/
Sample library - https://code.google.com/p/jquery-oembed/
I guess hugo can provide a config option e.g.
oEmbed = on or
oEmbed = off
If oEmbed is on, a jquery or other library can be added to each generated page which will transform link to rich-media content.
Not sure if such thing should go in hugo-core or to be handled by hugo-themes. Would like to know what other thinks about this?