Q: How do I get a video from my iphone to my ipad?

If your iPad is a Mini or if it's fourth generation or later, and both your iPhone and iPad are on iOS 7, you can use AirDrop as documented here:

http://support.apple.com/kb/HT5887

Otherwise, you would have to use iTunes on your computer.  Sync your iPhone using iTunes, then sync your iPad (assuming it uses the same Apple ID and password) using the same iTunes.