From what I understand (from a 'The Talk Show'/John Gruber podcast, IIRC), the default view for fullscreen landscape video has black bars on the left and right. It's only when you double tap to go to full screen (and thus cropping the top/bottom) that the notch interferes with the video. He made the point that Apple showing the notch covering video was them kinda going out of their way to highlight that the notch was there.