Connect the iPhone to the PC with a USB cable
Unlock the iPhone and tap Trust This Computer if prompted
Open File Explorer on the PC
Select Apple iPhone under This PC
Open Internal Storage
Open DCIM
Copy the video files to a folder on the PC
Use the Photos app on Windows
Select Import
Choose From a USB device
Select the videos to import
Use iCloud Photos on the PC
Install iCloud for Windows
Turn on Photos in iCloud
Download the videos from iCloud Photos to the PC
Use AirDrop alternatives or cloud storage
Upload the video from the iPhone to Google Drive, OneDrive, or Dropbox
Download the video on the PC from the same service
Use email or messaging apps for small videos
Attach the video on the iPhone
Send it to yourself
Open the message or email on the PC and download the video