You should already perform a zoom of 200% by using the shortcut "3"
You can use also + and - to resize your movie
The movie is always centered, if not just use + one time, it centered it on screen (maybe a little bug).
When the image is smaller than the screen and if you're playing your movie in fullscreen mode ("F"), it automatically add black border if needed...
It always keeps the aspect ratio if the options is checked, look in the video menu
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