How to transfer videos from iPhone to iTunes?

I downloaded videos from a website and saved them to my computer, added the folder of videos to iTunes, transferred the videos to playlists on my phone but they had to be manipulated and sorted as music videos for it to be sorted into playlists.
Then I somehow lost iTunes so I downloaded it again but the videos aren't on my iTunes library so if I sync it will delete them.

How do I get the videos from my phone into the library?

If you have a cord, you can connect your phone to the computer and upload it like that

Why not use Syncios iPhone Transfer to help you. It can transfer and backup all your files on iPhone or PC.
With Syncios manager, you can play music, video, etc.directly from your iPod, iPhone, iPad without iTunes. Even create and edit playlists for your iPod/iPhone/iPad, transfer or delete files between your devices and PC.