[Notorious_BLT]

Not getting into the rest of it, but the reason the "pinch to zoom" discussion is important is that the piece of video they are attempting to zoom in on is the one the prosecution's final gambit hinges on. As the self-defense evidence has stacked up, the prosecution has attempted to make the case that Rittenhouse provoked Rosenbaum's attack by pointing his gun at him. Despite the pile of video evidence available of the evening, no other evidence or testimony corroborates this claim, and in the (allegedly critical) video evidence they want to zoom in on, Rittenhouse is about 15 pixels tall. In that scenario, the specifics of how zooming will affect the video are pretty critical.

There's another discussion to be had about wether the provocation element was introduced in good faith, or as an attempt to allow the jury to introduce their own opinions on wether his presence or his open carry were inherently "provocation", as well, which is thought to be the reason the defense has fought so strongly against the video being permitted (As the video is the only way the prosecution was allowed to introduce the concept of provocation into the jury instructions at all).