A video playing (perhaps of a talking head), can through event triggers, present other media (such as wiki pages or alternative videos or links), and in this way take the viewer through a body of work.
It should be possible to use images, and links form Wikipedia and other sources to illustrate such a talk. Stopping or pausing a guide, would then give the viewer the opportunity to read around the subject, before continuing on with the Guided Tour.
Using HTML5 Media Synchronisation based in hacking the track and cue events of HTML5 Video such guides can be created based on web standards with a suitable tool.
Deliberative would be such a tool. It could allow recording of video or audio, together with timing associated with interacting with long form video, interacting with other speakers in Video Conference Debates, and exploring web sites.
# See also - Interactive Video - Argument Maps of Long Form Video - Creative Mixes - Video Guides - HTML5 Media Synchronisation