gZoom didn't work for me and says "Hooked" even when the GW2 process isn't in memory, so it seems suspicious. Is it working for anyone other than the OP?
You can write this cheat for yourself with Cheat Engine fairly easily.
Camera Zoom:
- Value Type: FLOAT
- Default Value: 600.0 (Zoomed all the way out)
- Default Value: 100.0 (Zoomed all the way in)
- You will need to lock the value or it'll slowly pan back in/out to the nearest of 100.0 or 600.0.
- Setting this to a value of 0 sets GW2 to first person view.