Nikon S5200 - Manual (Page 187)

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Autofocus Mode
Select how the camera focuses.
C
Autofocus Mode for Movie Recording
Autofocus mode for movie recording can be set with Autofocus mode ( E80) in the movie menu.
Select A (auto) mode M d button M Autofocus mode M k button
Option Description
A Single AF
(default setting) The camera focuses when the shutter-release button is pressed
halfway.
B Full-time AF
The camera focuses continuously until the shutter-release button is
pressed halfway. Use with moving subjects. The sound of lens drive
movement will be heard while the camera focuses.