Starting with iOS 13, it’s easier than ever to edit and share videos directly from your iPhone or iPad. Apple added a host of new video editing tools. You can now adjust exposure, highlights, shadows, contrast, saturation, sharpness, apply noise reduction, crop, trim, and perform many other editing actions without a third-party app.
In the iOS Photos app:
Locate the video you wish to edit.
Click Edit from the top right of your screen.
Make your choice edits and click Done from the bottom right of your screen.
If you're unhappy with your changes, open the video and click Edit and then click Revert.