How to access Height Offset property (Orbital Transposer)

I was trying to get the variables from a Virtual camera in Running Time in order to move the offset but I can't find which is the proper method or property to get this values.
My virtual camera is following the character from behind and Looking at character head, so I can see the scenary from behind the character.
In certain ocations I want to move the camera up or down without loosing those focus on the character.
Could anyone tell me how can I achieve this?