Connecting iPad to a USB powered monitor? I'm thinking about buying a USB powered monitor to connect to my MacBook. 

I found so many nice ones and the most suitable was Asus. 

ASUS MB MB168B+ 15.6-Inch Screen LED-Lit Monitor 

Now that got me wondering if I can also connect my iPad somehow to watch a movie or display something for a client that would be very useful.

I tried looking up anything remotely related to the subject but failed and thats why I'm here asking the experts.

Jailbroken iPad mini 2 and MacBook Air 11″
The iPad does not support video output over USB; it's a limitation you cannot work around with a jailbreak. Your only options are composite and VGA  video output via supported Lightening adaptors. There are jailbreaks that allow you to output the video 100% of the time though, not just from apps that support mirroring.