Powerpoint allow you to trim your embedded videos, you may want to extract a specific part, or remove irrelevant portions. The integrated video editor of Powerpoint allow you to trim the beginning or end of your video clip.
1.In the Normal view mode select the video, click Play.
2.Go to Video Tools > Playback > Editing > Trim Video
3.Using the slider (green and red) button, select the parts you want to remove.