More to your question... CarPlay does NOT support iPads or iPods, only iPhones. I have a new '16 Silverado with CarPlay. Among the family we have 2 iPhones, 2 iPads, and 1 one iPod Touch. Only the iPhones are recognized with CarPlay. The iPads and iPod Touch are not. So your question about movies have been answered, but the core of your question... using an iPad... is not possible.
On a side note... I don't get this. I guess if a data connection (3G/LTE) is required, I can understand excluding certain devices (like a WiFi only iPod Touch). But both of our iPads have LTE and data plans just like our phones, so I'm not sure why one would work, but not the other. The only real difference is the iPads don't do phone calls.
Something else to consider with CarPlay... its a convenience thing and for the sake of convenience... some privacy is lost. I don't mean "sending data to 3rd parties privacy"... Apple does a great job of stopping that. But I mean personal space privacy. Picture the scenario... you're married, but you have a girlfriend on the side. Your wife never sees your phone... so its all good on the down low. But you're driving with the wife when the G/F txts you. So your wife says "who's that". Consider the outcome... there's no good answer other than lying. If you play the message, you're incriminated. If you ignore it, what excuse do you have for not having Siri read it to you? So now you look guilty. Hmmm...
Or consider what happened to me: I was trash talking the boss to the wife via txt all morning at work. A few of us go to lunch and the boss rides with me. The wife txts me and I let Siri read it... and then I turn red in the face as my wife talks about the likely miniscule size of the bosses appendage... and the boss in my passenger seat.
Its sort of like all the Apple apps on our phones that we don't need (do you need the Apple Watch app if you don't have an Apple Watch?)... until Apple allows you to choose which apps show up in CarPlay, its a potential privacy and security concern. And until more devices and more apps support it, its more of a novelty. For example... why does Waze support it?
