There's no easy way. Every game is different.
The easiest way to figure out the field-of-view is to modify the field-of-view via in-game actions and check for changes.
Stand still, search in memory for an unknown value, zoom in, search in memory for a decreased value, zoom out, search in memory for an increased value, and then here I like to stand still and search for values that haven't changed. It will filter out a lot of items. I repeat this search until I feel like enough have been filtered out that I can continue with searching for increased or decreased values.
The field-of-view could be in degrees or radians. It could be a horizontal or vertical field-of-view. It could be a float or an integer (it's usually a float, but I've seen on occasion where it's an int).
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