The gimbal doesn't work with the normal mission planner setup configuration for multiwii pro 2.0. So you have to go into advanced parameters and type change these settings:
CAM_P_FUNCTION 7
CAM_R_FUNCTION 8
MNT_MODE 2
MNT_STAB_PITCH 1
MNT_STAB_ROLL 1
If you want to control the pitch with channel 6 input make this change instead:
MNT_MODE 3 (instead of MNT_MODE 2)
