Best way to stream video from iPad or iPhone to Macbook ?
If you have an iOS 8 device with a Lightning cable (i.e. no iPhone 4S) and Yosemite, you can do this without an Apple TV.


Plug in your iDevice to your Mac.
Open QuickTime.
Click File > New Movie Recording.
Select your iDevice as the input source.


You can find these instructions online with pictures here.