Nikon Z 8 Reference Manual page 203

Tip: Adjusting White Balance During Video Recording
White balance can be adjusted during video recording by holding the U button and rotating a
command dial.
Tip: Using a Fixed Shutter Speed
In mode M, shutter speed can be set to values between ¹⁄₂₅ s and ¹⁄₃₂₀₀₀ s (the slowest available shutter
speed varies with the frame rate).
Tip: Wireless Remote Controllers and Remote Cords
If [Record videos] is selected for Custom Setting g2 [Custom controls] > [Shutter-release button],
the shutter-release buttons on optional wireless remote controllers and remote cords can be pressed
halfway to focus or pressed all the way down to start and end video recording.
Tip: Using an External Microphone
Third-party microphones with 3.5 mm mini-jack plugs can be used to record audio for videos.
Use [Mic jack plug-in power] in the video recording menu to choose whether the power for the
external microphone is supplied by the camera ( 0 545).
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Points to Note When Filming Videos