Boomerang Android App Demo

Hi i want you to develop app like boomerang. Make sure do not use any github project because all have bugs. Write a simple, fast and reliable code which do not crash. Flow of will be like this open camera, take pics/video and show boomerang in preview. No UI required nothing else, you just need to make demo. You need to provide demo apk to get the project. Sample App Link of Google play store: https://play.google.com/store/apps/detailsid=[login to view URL] Thanks