The app allows you to take any video on your device and apply different filters - like Instagram-style color profiles - to it. That way, your results could have a warmer or cooler effect, or be switched to black and white or sepia tones.
You can also use VideoShow to add subtitles to any video, or to change its audio. Just select the appropriate options while you play the video from within the editor, and you can apply any change you so choose.
Once you've finished editing your video, you can export it with the same quality as the original, or compress it to save space. Of course, if you compress it the quality will be reduced, but it will also be easier to share with others.
VideoShow is a simple video editing tool that produces good results. It's ideal to help you make small changes to your favorite videos.