recording ipad air has black padding

[eyalyakir]

I am using my macbook and ipad air to record lessons. 

When i record the lessons i have this layout :

as you can see about 15% of the screen is black (on the right and left) also the screen is "cut out" in the recording

i want it to be like this with less  black area or even none.

how can i fix it?

thanks!