Now we have a motion-tracking function that is run for every frame of video that comes in. Let's retrieve the coordinates and draw a blue circle where there is motion.
现在有了一个运动跟踪函数，对于视频的每一帧都会运行它。
Anything you can do with an SDL Surface you can now do with your motion-tracked blue dot example.
可以用SDLSurface实现的任何事情，现在都可以用跟踪运动的蓝色圆示例来实现。
Anything you can do with an SDL Surface you can now do with your motion-tracked blue dot example.
可以用SDLSurface实现的任何事情，现在都可以用跟踪运动的蓝色圆示例来实现。
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