Nikon S3600 - Manual (Page 157)

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Autofocus Mode
Set how the camera focuses in movie mode.
Enter shooting mode M d button M D menu icon M Autofocus mode M k button
Option Description
A Single AF
(default setting)
Focus is locked when the b (e movie-record) button is pressed to
start recording. Select this option when the distance between the
camera and subject will remain fairly consistent during recording.
B Full-time AF
Camera focuses continuously during movie recording. Select this
option when the distance between the camera and subject will
change significantly during recording. Use of Single AF is
recommended to prevent the sound of the camera focusing from
interfering with recording.