Taking a guess that this guy missed his chance to board the plane because he was running at it with a suitcase.
He ended up climbing onto the wing while the plane wasn't moving. Authorities were called in to remove him.
The guy who recorded this and posted it shared an update later on:
Dear Nigeria!!!!! Update: He has finally been apprehended and we've all disembarked from the flight. FAAN authorities showed up 23 minutes into the scene but were scared to approach him. Security eventually shows up after 37mins.
Crazy stuff! You can hear all the passengers yelling on the plane from this clip.