It is simple to transfer videos and other data from your iPhone to your iPad with AirDrop. First you need to make sure that AirDrop is enabled on both your devices. To do this, open Control Central by swiping up from the bottom of each screen and then tap on AirDrop to make sure it is enabled on each device. You can also choose to share with just some contacts are for everyone.
After you have enabled AirDrop on both your iPhone and your iPad, open the Photos app on your iPhone and choose the video you want to transfer to your iPad. At that point you can select the video or videos you want transferred and then tap on the Share button in the lower left hand corner of the screen.
After you have tapped on the Share button on the video you want to transfer from your iPhone to your iPad, you will be able to tap the name of your iPad from the AirDrop contact menu. If you just enabled AirDrop on your iPhone and iPad, it might take a couple of minutes for it to show up, but give it some time and then you will see it. Then you can confirm the video transfer and it will begin. Longer movies take some time to transfer, so your patience will be required.