Note: The video will overlay over a page rather than insert as a separate page. So, if you want to have the film as the whole page rather than a part, you may need to add an extra blank page for the film in to your document.
To do this in Acrobat Pro:
Open the PDF.
Choose Tools > Rich Media, and then select the Add Video (you can also just Add Sound).
Drag or double-click to select the area on the page where you want the video or sound to appear. The Insert dialog box opens.
If you double-click the page, Acrobat Pro places the upper-left corner of the video where you clicked. If you drag an area on the page, the media is placed within the area. The play area of the video is the exact size of the video frame (if Acrobat Pro is able to read the video clip dimensions).
Click Browse to find the media file (or Add a URL in the Name field if the film is on the web), and then click Open. For URLs, use the full file address, including the video filename extension, such as .mov or .mp4.
Use the advanced options on the Insert dialog box to change the media if needed, and then click OK. Not all of these options are available for all media types.
Snap To Content Proportions Ensures that the play area retains the height and width ratios of the original video or interactive content.
Show Advanced Options Opens the dialog for additional settings such as launch settings, playback controls, and video settings. The options available depends on the format of the media you are inserting.