Best way to stream video from iPad or iPhone to Macbook ?

I am planning to create some app tutorials (screencasts) using Screenflow on my Macbook

The apps are iPhone and iPad apps so I want to show the live app in the tutorial and mix in other aspects which Screenflow lets you do.

I think therefore I just need to get the iPad to stream to a Window on my macbook - then I can capture it.

I have an Apple TV and I think I read that this is the best way to do this - but not sure the exact set up - can anyone advise?