URGENT CAUTION . . . . neither of those . . . FOCUS + SCREEN . . . are even REMOTELY related to the cause of your fault, and their maladjustment can seriously impair picture quality. No touchee - touchee.
As for that shown problem it appears to be a compatibility problem.
That TV combo is new enough in design to be using digitally derived sync . . .therefor there is no typical old school vertical hold control incorporated.
Notice that the pic is in normal vertical lock for most of the time, then for an instant the vert sync is "obliterated " for just an instant and then the unit snaps back into vertical lock, until the next disruption.
This video appears to be from a game so i would NOT fault the TV but a compatibility between the TV and the game .
Play a prerecorded VCR tape and all should be well with the TV, as well as recording some off air TV and then playback with all being well.