KayKayKay's solution is the best, in my opinion. It is reliable and fast.
However, if you want a wireless method you can get the PhotoSync app (one word). Buy it once and install it on both devices, and it must be open on both devices. It will copy videos and photos between your iOS devices, and the computer too.
There are other similar apps that will probably do the same thing, but I don't have them to test.