Nikon Z 8 Reference Manual page 93

The camera can be refocused during recording by pressing the AF-ON button.
Sound is recorded via the built-in microphone. Do not cover the microphone during
recording.
You can also focus by tapping your subject in the monitor.
3
Press the video-record button again to end recording.
D
The Memory Card Access Lamp
The memory card access lamp will light while the video is being
recorded. Do not remove the memory card or battery.
D
The 0 Icon
A 0 icon indicates that videos cannot be recorded.
D
Cautions: Recording Videos
Video recording will end automatically if:
- the maximum length is reached,
- the battery is exhausted,
- you choose a different shooting mode,
- you switch modes using the photo/video selector,
- the lens is removed, or
- the camera's internal temperature rises.
Sounds made by the camera may be audible in footage recorded:
- during autofocus,
- during vibration reduction, or
- when power aperture is used.
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Recording Videos