First thing you want to do is to find a video that you want to embed in a PowerPoint file (it might be PowerPoint 2007 also). After that you might see the video and decide of the final quality of it (dependent on your internet speed ). In the right side of the video you will see a URL link to it, copy that to your PowerPoint to have it ready for next step. On your PowerPoint file enable the Control Toolbox and follow the instruction .Be sure that you modified properly the web address . Voila, your video is reedy to be presented.