How to Transfer Photos from an iPad to a Computer
Importing Personal Photos and videos from your iOS device to your computer.
There's also some apps that will transfer via wifi. Using these apps may be the easiest way of transferring your Photos and Videos to your computer and other iOS devices.
Simple Photo & Video Transfer
Simple Transfer App
Easy Media Transfer : Useful App for Wireless Transfer
Copy Photos (& Videos) Between iOS Devices
You could transfer the video on the iPad to iCloud or Dropbox, and then download to your Mac.