Live Zoom allows you to zoom in or zoom out on a portion of a video while it’s being played to make the desired section appear larger or smaller.
While viewing a video, use your index finger and thumb in a pinching or spreading motion on the screen to zoom in or out. While zoomed in, you can drag across the screen to pan to parts of the recording subsequently not visible due to the zoom level.
You don't need to press too hard; the screen is sensitive enough to pick up a light, but firm touch.