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I was a 3dsmax user before and kinda missed this functionality of creating new camera from selected view,This is feature already exist in 3DS max. [Create> Camera > from Selected View ]The script can be used in combination with ALT or CTRL or CTRL + SHIFT too, All values of existing view camera are copied to new camera and the old camera moves back to show new camera.
Insert the line below in your buildPanelPopupMenu.mel which is located
at this location: C:\Program Files\Autodesk\MayaXXXX\scripts\others [where XXXX is replaced by version of maya]
Look for the code below in the file buildPanelPopupMenu.mel [line number 312]