Build failed because minsdkversion is set to 21

[Shrirama-Upadhya-A]

I'm trying to integrate this dependency in my application which should support devices from Android API 19.
This is the error when I tried to build the app with minsdkversion 19.
Manifest merger failed : uses-sdk:minSdkVersion 19 cannot be smaller than version 21 declared in library [com.github.israel-fl:bitmap2video:2.0.0] /jetified-bitmap2video-2.0.0/AndroidManifest.xml as the library might be using APIs not available in 19 Suggestion: use a compatible library with a minSdk of at most 19, or increase this project's minSdk version to at least 21, or use tools:overrideLibrary="com.homesoft.encoder" to force usage (may lead to runtime failures)

Is there any way you can reduce the minsdkversion from 21 to 19? Or does this dependency require atleast Android API 21?