Play movies and other video in iTunes on Mac
Use iTunes to play:
Movies purchased or rented from the iTunes Store
TV shows purchased from the iTunes Store
Music videos purchased from the iTunes Store
Any compatible video (such as H.264 or MPEG-4)
Play a video
In the iTunes app
on your Mac, do one of the following:Play something from your video library: Choose Movies or TV Shows from the pop-up menu at the top left, then click Library.
Play a music video: Choose Music from the pop-up menu at the top left, click Library, then select Music Videos in the sidebar on the left.
Double-click the video, or select it and click the Play button (or use the Touch Bar).
The video plays in a separate window, which you can resize and move.
To control video playback, move the pointer anywhere over the playback window to make the controls (Play/Pause, Volume and so on) appear.
Use subtitles and alternative audio tracks
Some videos feature subtitles, closed captioning, and alternative audio tracks (for example, tracks in other languages).
In the iTunes app on your Mac, to change audio and subtitle settings while a movie is playing, do one of the following:
Choose Controls > Audio & Subtitles > [option].
Move the pointer over the movie until the controls appear, click the Subtitles button
, then choose an option.If your Mac has a Touch Bar, you can also tap Subtitles.
Tip: To customise captions and subtitles, choose Apple menu 
> System Preferences, click Accessibility, then click Captions. See the Apple Support article Change the subtitles or audio language of iTunes Store movies and TV shows.
View iTunes Extras
Some movies on the iTunes Store come with iTunes Extras, an enhanced movie-watching experience that features bonus content, exclusive interviews, videos, photos, and more. Movies with iTunes Extras are identified with a badge on the iTunes Store and in your iTunes library.
In the iTunes app on your Mac, to view iTunes Extras in movies that include them, do the following:
Click the movie’s iTunes Extras badge in your iTunes library (or use the Touch Bar).
If you can’t see your video playing
By default, videos play in the iTunes window. If you changed the location to a separate window, the iTunes window may be blocking the window where the video is playing. Try any of the following:
On your Mac, move the iTunes window.
In the iTunes app
on your Mac, click Window in the menu bar, then choose your video if it’s listed.
Videos purchased from the iTunes Store can be viewed only in iTunes and QuickTime.