The steps to build and use MediaPipe AAR is documented in MediaPipe's android_archive_library.md.

The source code is copied from MediaPipe's multi-hand tracking gpu demo. It's a branch, because on master it was deleted

Usage in Gradle

in top build.gradle

allprojects {
  repositories {
    ...
    maven { url 'https://jitpack.io' }
  }
}

and in module build.gradle

dependencies {
  implementation "com.github.hannesa2:mediapipe_multi_hands_tracking:$LATEST"
}

Please see details here https://jitpack.io/#hannesa2/mediapipe_multi_hands_tracking