Nikon S8200 - Manual (Page 171)

E 59
The Movie Menu
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Autofocus Mode
Select the autofocus method used when recording normal speed movies.
Enter shooting mode M d button M D tab M Autofocus mode
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
the subject will remain fairly consistent.
B Full-time AF
Camera focuses continuously.
Select this option when the distance between the camera and
subject will change significantly during recording. The sound of
the camera focusing may be heard in the recorded movie.
Use of Single AF is recommended to prevent the sound of the
camera focusing from interfering with recording.