Stream to your HDTV from iMovie on iPad
If you have Apple TV and a high-definition television (HDTV), you can watch your iMovie projects on your TV using AirPlay. AirPlay uses wireless technology to stream movies to your TV.
Note: AirPlay is available only when streaming from a device to an Apple TV with tvOS 4.2 or later.
In the iMovie app
on your iPad, tap a project in the Projects browser, then tap the Play button 
.Note: Make sure that your HDTV and Apple TV are both turned on.
The project begins playing in full-screen view on your device.
Swipe up from the bottom of the screen to open Control Center.
Tap AirPlay to see a list of available Apple TV devices.
AirPlay prepares to play the movie.
When preparation is complete, tap the Apple TV you want to use, and tap to turn on Mirroring.
Your movie begins to play on your HDTV. (The device screen is black and shows the playback controls.) Depending on the length of your movie, you may experience a delay before playback begins.
When the movie ends, tap Done in the upper-left corner of your device’s screen.
You can also view your movie directly on your HDTV using your iPad. See View your movie on an HDTV in iMovie on iPad.