You can use the Adobe Premier Rush video editing app to shoot, edit, and share videos within the app. It also offers virtually all the tools that you need for video editing that include trimming, color changes, voice-overs, titles and transitions, noise reduction and audio and graphics. You can also use it to resize your videos (landscape or portrait) and rearrange them as required. With regards to its pricing, it will cost you $9.99 for the Premiere Rush app alone.