Video Star for iPhone
is a free application that allows you to create music videos on your own device. It can also be used to make vlogs and other general video editing.
To make your videos pop, Video Star has a broad catalogue of effects and editing options.
The app is free to download, and it supports multiple languages. However, you can also upgrade with to the All Access Pass version to earn access to a larger set of video editing options for $4.99/month, $12.99/three months, or $29.99/year.