translation.en: And the blue hoods helped us with two things: one, we could easily erase their heads; and we also put tracking markers on their heads so we could recreate the camera motion and the lens optics from the set.
translation.zh: 和蓝盖帮我们两件事情： 1，我们可以很容易抹掉他们的头上; 我们也把他们的头标记跟踪 这样我们就可以重新相机的动作 从镜头的光学设置。