Retrieve the focus state of the camera
camera_error_t camera_get_focus_state(camera_handle_t handle, camera_focusstate_t *state, camera_region_t *region)
Determine the focus state and the region of focus. Typically, you call this function when a status event of type CAMERA_STATUS_FOCUS_CHANGE is received.
The viewfinder must be running before using this function.
CAMERA_EOK when the function successfully completes, otherwise another camera_error_t value that provides the reason that the call failed.