'Which background substraction methods I should follow?

I have a college work which I have a short video to cut the background off (keeping only what moves in the scene) with three differente method,

  • Fixed Background or Fixed Fundus
  • Average background or average fundus
  • Median background or median fundus

So I searched and found this example from OpenCV: https://docs.opencv.org/3.4/d1/dc5/tutorial_background_subtraction.html So I guess this should be the first one

And this : https://learnopencv.com/simple-background-estimation-in-videos-using-opencv-c-python/ Should be the median fundus..

Am I right? I'm confused because the teacher did not pass us the terms in english. This algorithms are right with the methods required? Or where can I find example of these methods?



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