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HoloLens coordinate systems and World Coordinates in particular

Hello,
I am currently trying to acquire World Coordinates of the point specified by it's location in pixels on Photo-Video Camera image.

I have read MSDN documentation about Locatable camera. In this paragraph it provides the way to "get from pixel to world coordinates".
I am interested in the meaning of the 'World Coordinates' and the whole HoloLens coordinate system stuff. I understand World Coordinates as AmerAmer explains in this discussion: "Hololens uses your physical position at the starting point of the app as world origin and provides you the View matrix based on that position"

Is he talking about 'World Coordinates'? If so than HoloLens device coordinates must constantly change in the World Space as the user walks. And what is the 'View Matrix'?

Can you please explain these concepts or provide link to the documentation or other explanation?
I tried to find it myself but unfortunately I have not succeeded. Can you also explain 'Camera View Space' and 'Camera Coordinate System'?

Thanks

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