If you want to capture a video of what's happening on your iPhone 11's screen, you can use a built-in iOS to do Screen Recording. It's like taking a screenshot, but a video. This works on both the iPhone 11 Pro and iPhone 11 Pro Max.
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First, enable the “Screen Recording” button on your iPhone 11
To make a screen recording on your iPhone, you must first enable a special “Screen Recording” button in Control Center.
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To do this, first open Settings by tapping the gear icon.

In Settings, tap “Control Center.”

In the Control Center settings, scroll down to the “More Controls” list and tap “Screen Recording.”.

The “Screen Recording” option will move to the “Included Controls” list. You can tap and drag items in this list to rearrange them on the Control Center screen. Once you’ve arranged the order to your liking, exit Settings. Now you’re ready for the next step: recording.
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How to Screen Record on iPhone 11
Now that you've added the Screen Recording button to Control Center, you can record your screen at any time. First, open Control Center by swiping down from the top-right corner of the screen.

In Control Center, find the Screen Recording button, which looks like a circle inside a circle. For a quick recording without sound, tap it once. For a recording with sound, tap and hold.

After holding down the Screen Recording button for a moment, another screen will appear. To record with audio, press the microphone button until it turns red and says “Microphone On.” Then select “Start Recording.”

The screen record feature will start a three-second countdown, and when the countdown is complete, the screen record button in Control Center (and the clock in the upper-left corner) will turn red and your iPhone will begin recording everything on the screen as video. If you enabled the microphone, your iPhone will also record audio.
To stop taking a screen recording, you have two options. One way is to use Control Center: Open Control Center and tap the Screen Recording button again.

The screen recording will stop immediately. The other option is to tap the red clock in the top left corner of your screen and select “Stop” in the pop-up dialog box.

Either way, once the screen recording is complete, you will see a confirmation that the screen recording video was saved to your photo library.

To view your screen recording, open the Photos and tap the recording thumbnail, and it will play like any other video stored on your iPhone. If you want, you can use the Photos app's editing features to trim the video to the desired length.
Information source: howtogeek.com
