Open the PowerPoint presentation and navigate to the slide that you want to upload the video on. Then, click on insert on the menu bar and on the resulting options, click on movies and sounds. Choose the insert movie from file option, and browse to the folder where the video is saved. Double-click o the video and on the dialogue box that appears, select play video automatically or when clicked. See http://www.ehow.com/how_6766282_upload-videos-powerpoint.html.