Nikon D750 DSLR Camera (Body Only) - Manual (Page 410)

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Photographs taken while On is selected contain information on
camera orientation, allowing them to be rotated automatically
during playback (
0 242) or when viewed in ViewNX 2 (supplied)
or in Capture NX-D (available for download; 0 268). The
following orientations are recorded:
Camera orientation is not recorded when Off is selected.
Choose this option when panning or taking photographs with
the lens pointing up or down.
Auto Image Rotation
G button
➜
B setup menu
Landscape (wide)
orientation
Camera rotated 90°
clockwise
Camera rotated 90°
counter-clockwise
A Rotate Tall
To automatically rotate “tall” (portrait-orientation) photographs for
display during playback, select
On for the Rotate tall option in the
playback menu ( 0 308).