How to transfer video files from ipad air to macbook air
If you prefer not to sync the whole library with iTunes there are plenty of other things you can do, but most require network connection: 


Apple's Photos app 
Image Capture
Airdrop (as mentioned above)
Since you mention file system access, and non-wireless transfer that would only be possible with 3rd party utilities (iMazing, iExplorer, PhoneView and more...) I won’t post links here, sure you’ll be able to find yourself. 


Disclosure: I work with the iMazing team.