How do I trim the content of a video on iPhone?

Before answering this question, I'm not asking about trimming the length to cut off extra seconds. I'm asking about how to trim the area where the video is captured. For example, only capturing a certain portion of the screen instead of the entire screen. Please let me know.

You mean cropping then. You'd have to use an app for that (on the iPhone) or a video editor on a computer. IMovie for iOS & macOS can do that. Windows Movie Maker also if you have a Windows computer.

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