You can try something like that, the camera spring will rotate around whatever it is attached to (comment out the CameraTick()).
if ((gesture & TouchGestures::SwipeDownUp) == TouchGestures::SwipeDownUp)
{
if (mainCameraSpring)
{
FTransform transform = mainCameraSpring->GetRelativeTransform();
FRotator rotation = transform.GetRotation().Rotator();
rotation.Yaw += 5 * CameraSpeed;
mainCameraSpring->SetRelativeRotation(FRotator(rotator.Pitch, rotator.Yaw, 0));
}
...
...