Sound and Video are opposites, therefore it is impossible to record a video using sound. (I may have got the question wrong, but here's the other answer)
Your Microphone could be broken or muted. flick through all of the options in settings to find any options to mute the mic when recording videos. If there is no option for that, either try turning up the volume to full or consider either getting the microphone replaced or consider getting a new camera.
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