How do I focus and Zoom my cameras through the NVR?

While viewing the camera, press the camera number to full screen that specific camera.  Next, press the PTZ button to access the control menu.  The top set of icons are your zoom options.  The left shows a zoomed in image of a person, this is to zoom in.  To the right of that button is the zoom out, it shows the body of the person to represent this.  Underneath the zoom buttons are your focus buttons.  Depending on where the camera is currently focused would depend on which button to press.  The change is very gradual, but you can hold it down for a more rapid change.  Once you get as close as possible, press the RF button which will autofocus the camera to the best possible position.