There are times when – for reasons of privacy or even a person’s physical safety – you want to make certain parts of a frame in a video unrecognizable so not to give away someone’s identity or the place where you shot the video. While it’s fairly easy to achieve something like that for a photograph, it’s a lot more challenging for video because of two reasons: 1) You might have a person moving around within a shot or a moving camera which constantly alters the location of the subject within the frame. 2) If the person talks, he or she might also be identifiable just by his/her voice. So are there any apps that help you to anonymize persons or objects in videos when working on a smartphone?