Connect your iPhone to your PC with a USB cable
Unlock your iPhone and tap Trust This Computer if prompted
Open the Photos app on your PC
Select Import
Choose From a USB device
Select the videos you want to import
Click Import Selected
Wait for the transfer to finish
Open File Explorer
Go to This PC
Open Apple iPhone
Open Internal Storage
Open DCIM
Copy the video files to your PC
Use iCloud Photos on your PC if you want wireless transfer
Install iCloud for Windows
Sign in with your Apple ID
Turn on Photos
Download the videos from iCloud to your PC