Solution
The optical zoom cannot be used during movie-recording.
You can use the digital zoom, but images may appear coarse.
Caution
To use the digital zoom during movie-recording, you need to set the [Movie Mode] to [Standard] ().
If the [Movie Mode] is set to either [Color Accent] () or [Color Swap] (), the digital zoom cannot be used during movie-recording.
Caution
If you want to zoom in to capture a subject, adjust the size with the optical zoom before shooting.