Sometime the original look of the inserted video may not work well with the color palette of your presentation. You could play around with the brightness and contract for an inserted video by using the Corrections option. Additionally, you can also completely recolor your inserted video — so you can make your full color video appear as a grayscale video, or even like a duotoned video such as blue and grayscale — or any of the other Recolor options.
Learn about the Recolor options for videos in PowerPoint 2013 for Windows.

