I did a bit of googling previously, what follows is my calculations for it. (Note that I'm not an optical expert and there's a good chance I'm wrong.)
For rectilinear (normal) lenses, the Field of View (FoV) is calculated as:
2 * arctan (<sensor size>/(<focal length> * 2))
I found that the OV7620 by default has the "Yasan 1/3" Focal Length 6.0mm, F1.8 Glass #604180 LCR1(Coating)" lens and the sensor is 4.86mm x 3.64mm.
After doing the necessary trig, I came up with the answer that the FoV is 44.09589 x 33.74860 degrees. I haven't confirmed this, nor looked at the other thread, yet.