There are already plenty of decent blurring apps for photos on the App Store. Video Mosaic for iOS helps you blur your videos. It can blur entire videos or simply trace your finger. You can also anonymize people by applying a mosaic effect on their face.
Video Mosaic doesn’t have a steep learning curve. Simply bring your video, choose what you want to blur and even decide the shape of the blur. No need to use other fancy video editors to use this app.[where to get it]