How do I change video aspect ratio on iPhone camera from 16:9 to normal?

Hello!

Alternatively, you can swipe up on the “Video, Photo, Portrait” list just above the shutter button, tap the button showing the ratio, then select 4:3. I can provide screenshots for you if you need further clarification.

For video, the ratio cannot be adjusted.

Have a great day!

"How do I change video aspect ratio on iPhone camera from 16:9 to normal?: How to fix this when i open my camera and want to video it keeps 16:9 size i want same size of camera photo. not video size huhuhu help me."

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Selecting a Clip's Aspect Ratio:

To change the aspect ratio, tap the lock at the top-right corner of the photo to unlock the aspect ratio.

Source: Crop, Rotate, Flip, or Straighten Photos and Videos on iPhone - Apple Support