How to Record Video with an iPhone camera

1. Choose Video mode.
2. Tap the Record button or press either volume button to start recording.
3. Tap the Record button or press either volume button to stop recording.

• By default, video records at 30 frames per second (fps). Depending on your model, you can choose other frame rates and video resolution settings in Settings  > Camera > Record Video. Faster frame rates and higher resolutions result in larger video files. 
• On iPhone XS, iPhone XR, and later, iPhone uses multiple microphones to achieve stereo sound. To turn off stereo recording, go to Settings > Camera, then turn off Record Stereo Sound. 
• On iPhone 12 models, iPhone records video in HDR and shares HDR videos with devices using iOS 13.4, iPadOS 13.4, macOS 10.15.4, or later; other devices receive an SDR version of the same video. To turn off HDR recording, go to Settings > Camera > Record Video, then turn off HDR Video. 

Use quick toggles to change video resolution and frame rate 

• In Video mode, use quick toggles at the top of the screen to change the video resolution and frame rates available on your iPhone. 
• On iPhone XS, iPhone XR, and later, tap the quick toggles in the top-right corner to switch between HD or 4K recording and 24, 30, or 60 frames per second (fps) in Video mode. 
• To display quick toggles on iPhone X and earlier, go to Settings > Camera > Record Video, then turn on