opencv/sources/modules/java/android_sdk/android_lib/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="org.opencv">

    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" />
</manifest>