The iPhone XS has a screen aspect ratio of 19.5:9 so most 16:9 content should be easily viewable with pillar boxing (black bars on the sides) and make the notch

The iPhone XS has a screen aspect ratio of 19.5:9 so most 16:9 content should be easily viewable with pillar boxing (black bars on the sides) and make the notch "disappear". I'm fairly sure that this is the default and only if you double tap on the video to zoom in would it then fill the screen and make the notch noticeable.