If zoomInfo option not disabled, a small bar with current ZOOM value and 3 buttons will appear in the top left corener of the player. 2 buttons allow to center zoomed area, reset zoom and display information about zooming options. One more important feature for ZOOM plugin is an option "zoomWheel", disabled by default. If enabled, it is possible to zoom in video using mouse wheel. Zoom is disabled on touch screen device. You can zoom any area on touch screen device using your fingers.Below you can see the code with options enabled for this example.
var player = videojs('example_video_1');