Here is how you can record video on an iPhone with your screen off. To do that, go to the settings and tap on Accessibility, and tap on Guided Access. Turn this on. Also, make sure the Accessibility Shortcut is turned on. Go back, then go to Accessibility Shortcut, scroll down, and then turn on VoiceOver.

Now go to the home page. Triple-press the side power-off button and turn on VoiceOver. You will also hear the VoiceOver. If you see other notifications, please allow them. Now lower the volume to zero. Now, if you triple-tap on the phone screen, it will be off. And again, triple-tap it to bring back the screen. Please note this only works when VoiceOver is enabled. Anyway, now turn off the VoiceOver, make sure your volume is zero, triple-press the power-off button, and double-tap the VoiceOver.

Next, open Camera and switch to Video. Triple-press the power-off button and turn on VoiceOver. Now the camera is working, and you can start recording with the volume button. So it is recording. Now triple-tap on the screen, and the screen is off. But the recording still works. If you triple-tap again, the screen is on, but you will see it is recording, and you can simply click on the volume to turn off the recording.

Thank you very much.