public void setVolume(float volume) {
        mVolume = volume;
        if (mVideoTextureJni != null) {
            mVideoTextureJni.setVolume(volume);
        }
    }
Contains a VideoTexture that is set as a background video on the scene.
android/viro_bridge/src/main/java/com/viromedia/bridge/component/VRT360Video.java