You are implementing your video view after implementing all other things. You should first add your videoView and then SeekBar on it if you are using RelativeLayout.
something like below :
<LinearLayout
android:id="@+id/streams"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#40ffffff"
android:orientation="horizontal"
android:visibility="gone" >
<Spinner
android:id="@+id/language_spinner"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Spinner
android:id="@+id/subtitle_spinner"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1" />
<ImageView
android:id="@+id/full_screen"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_weight="1"
android:src="@drawable/logo_fullscreen" />
</LinearLayout>
<!-- This is layout with seekbar and text views with current time, video file length -->
<!-- I need to show it on the bottom of my video view -->
<com.ffmpeg.FFmpegSurfaceView
android:layout_below="@+id/streams"
android:id="@+id/video_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:visibility="visible" />
<RelativeLayout
android:id="@+id/controls"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="#33000000" >
<Button
android:id="@+id/play_pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:background="@android:drawable/ic_media_play"
android:contentDescription="@null"
android:enabled="false" />
<Button
android:id="@+id/scale_type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/play_pause"
android:background="@android:drawable/ic_menu_info_details"
android:enabled="true" />
<SeekBar
android:id="@+id/seek_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/scale_type"
android:alpha="0.5" />
<TextView
android:id="@+id/current_time_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/seek_bar"
android:layout_below="@+id/seek_bar"
android:layout_margin="3dp"
android:text="" />
<TextView
android:id="@+id/video_length_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/seek_bar"
android:layout_below="@+id/seek_bar"
android:layout_margin="3dp"
android:text="" />
</RelativeLayout>
<!-- This is my VideoView, all controls I must display over it - -->