Although there are many ways to enhance PowerPoint Presentations, fading videos in and out might be one of the more popular and professional edits. Here is a quick tutorial on how to fade a video out in PowerPoint.
Step 1 - In PowerPoint, select the video you want to edit by double clicking the added Video in your slideshow.
Step 2 - In the tabs section, select Playback then in the box next to Fade Out, figure out how long you want it to fade in for. Try starting with 3 seconds and see how that fits your content.