In iOS 14 and newer, users can change the video resolution and frame rate on-the-fly in Apple’s Camera app, without having to go into the Settings app.
When you open the iPhone Camera app and swipe to Video mode to get ready to shoot, you’ll see the resolution and resolution and frame rate in the top right of the Camera app, as shown below.
Tap to change or switch.
If the video quality is set to 1080p in Settings – Camera, you can tap the resolution in the Camera screen to switch between HD (1080p) and 4K. If you set it to 720p in Settings, clicking on the format will toggle between 720p and 4K.
When shooting in 4K, you can click on the frame rate to toggle between 24, 30 and 60 fps. If you are shooting in HD (1080p), you can switch between 30 and 60 fps, and when shooting in 720p, the frame rate is limited to 30 fps.
If you need to shoot video quickly, press and hold the Volume Down button or press and hold the Shutter button while in shooting photo mode.