If you access the camera via the webpage, you will see a button-bar at the bottom, allowing you to zoom 1x, 2x, 3x, 4x. But this is digital zoom, so no gain on the whole picture.
If you use the Playback feature of D-ViewCam (it is now 3.11, with lots more stability) you can zoom in much further, but again just digital, so no real gain, but in combination with the image-enhancement it still is something useful.
So, no native zoom in the 920, but digital zoom on either native webpage, or DViewCam Playback.