Overlay GPUImageView layouts don't work

[AndreyGrowl]

This is how my layout looks. But in result there is no seekbar visible. How to fix this?

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000">

    <jp.co.cyberagent.android.gpuimage.GPUImageView
        android:id="@+id/gpuimage"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

        <android.support.v7.widget.AppCompatSeekBar
            android:id="@+id/progress"
            android:layout_gravity="bottom"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:max="100"/>

</FrameLayout>

[AndreyGrowl]

@irfano lmao. Don't write anything if you don't understand the problem. Anyway, resolved this issue by deleting zOrder line in library code.