You can add video and audio to a document, then set how it plays.
Note: Video and audio files must be in a format that QuickTime supports on your Mac. If you can’t add or play a video or audio file, try using iMovie, QuickTime Player, or Compressor to convert the file to an MPEG-4 file (with a .m4a filename extension) for audio, or a QuickTime file (with a .mov filename extension) for video.
Do one of the following:
Drag a media file from your computer to a media placeholder or to anywhere else on the page.
Click 
in the toolbar, click Music or Movies, then drag a file to a media placeholder or to anywhere else on the page.
To search for media, click the magnifying glass in the upper-right corner of the media window.
Click the Play button 
on the media to play it in the document.
By default, a video or audio file plays one time when you click the Play button . You can have it repeat in a loop, and you can adjust its volume.
Select the video or audio on the page.
In the Format 
sidebar, click the Movie or Audio tab.
Do any of the following:
Set media to repeat: Click the Repeat pop-up menu, then choose Loop to have the media play until you click it again, or choose Loop Back and Forth to have the media play forward and then backward until you click it again.
Note: Audio that you recorded in Pages on your iOS device can’t loop back and forth.
Adjust the volume: Drag the volume slider.
Select the video or audio on the page.
In the Format sidebar, click the Movie or Audio tab.
Click Replace.
Select a video or audio file, then click Open.
Select the video or audio on the page.
In the Format sidebar, click the Movie or Audio tab.
Click the disclosure triangle next to Edit Movie or Edit Audio, then drag the Trim sliders.
Note: You can’t trim audio that you recorded in Pages on your iOS device.
You can choose the frame that’s displayed on a page to represent the video.
Select the video on the page.
In the Format sidebar, click the Movie tab.
Click the disclosure triangle next to Edit Movie, then drag the Poster Frame slider.
Select the video or audio on the page.
In the Format sidebar, click the Movie or Audio tab.
Drag the volume slider.
You can set Pages to optimize the format and quality of movies and images that you add to documents.