Signal-Android/app/src/main/res/layout/media_preview_video_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:viewBindingIgnore="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <org.thoughtcrime.securesms.video.VideoPlayer
        android:id="@+id/video_player"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>