Nikon V3 - Manual (Page 218)

194
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Choose whether the camera takes photos automatically while
movies are being recorded in auto, creative,
t, u, v, or w mode
or with HD movie selected in advanced movie mode. Photos will
be taken when a suitably-framed portrait subject is in focus and
the composition is stable. The maximum number of photos that
can be taken during a single clip is 20, including photos taken
manually (
0 64).
Auto Image Capture
Auto photography
The camera will take photos automatically during
movie recording if On is selected.
Max. shots per
minute Choose the maximum number of shots per minute
(one or four).