I believe you should be able to create a segment to exclude "the additional plays" but this is complicated.... since you don't want to exclude all additional plays throughout the entire visit (i.e. if the user views 5 videos, you want to make sure that you have at least 5 plays shown, that you aren't accidentally removing too many hits).
I think this would work, but please test it thoroughly:
HIT [
Video Play Event exists
AND
HIT container (EXCLUDE) [
VISIT container [
Video Play Event exists
THEN Within 1 Page View(s)
Video Play Event exists
]
]
]
Basically, this should return all "Video Play Events" excluding the Video Play Hits that have the sequence of Video Play followed by a Video Play (on the same page view)
However, if you have a page that has multiple videos, this will exclude too much
If this were something I would need, I would actually create a new event specifically built with logic to only trigger an event on the initial play of each video, and then not trigger again... this would be the safest option...