I think it would be just fine to cut away from the fretboard(s) for a 20 second interlude montage of interesting video bits, in whatever theme you'd care to choose, could be specific or abstract. Then fade back in to the fretboards. Maybe insert two or three of these interludes in your 4 minute video, just to break up the fingershow? 
 
the musicianship is fine of course, but even a guitar player's attention span is limited.  :)
 
cheers, and good work!
-Tom
 
 

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I like what you have here and the video keeps your attention but, as mentioned already, the lead doesn't cut through enough.