How to put a movie onto iTunes from my iPhone 4S?

I bought the movie "End of Watch" on my phone but its taken up a lot of memory so how do I put the movie/music videos onto iTunes I have the latest update of iTunes.

Click and hold onto the file. When you do so, a panel with devices and playlists will pop up on the right.drag the file onto the device. If you do not have enough gigs, you may want to delete some stuff.

You can just resync your phone to delete the movie off your phone. Then download the movie onto your computer by flowing these steps.
If you have Windows: http://support.apple.com/...kb/PH12491
For Apple computers: http://support.apple.com/...kb/PH12283

Plug in iPod to computer, then go to iTunes menu "File-> Transfer purchases", It will copy your bought movie from iPod to computer. Or You may take a look at this step by step guide, it's about how to transfer files from iPod touch to computer iTunes, it supports Apps, Contacts, Songs, Videos, Photos, Playlist, Games, etc. Data files. Easy to understand and works pretty well for my iPod touch.