All music and audio effects bundled with the app are copyrighted. You are free to use them in your video. You can use the video for any purpose you want. After all, you created it.
If you use the music provided by the app, please make sure to credit the author:
Music by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
You are not allowed to sell, redistribute, share the sound effects or make sound effects otherwise available, other them using them in the video you create with the app.