player.kv

<PlayerWidget>:
    id: player_widget
    name: 'player'

    GridLayout:
        cols: 1
        # orientation: 'vertical'
        spacing: 25
        padding: 21
        MDRectangleFlatIconButton:
            id: top_bar_button
            icon: 'arrow-left-bold'
            text: 'Back'
            theme_text_color: "Custom"
            text_color: 1, 192 / 255, 34 / 255, 1
            line_color: 1, 192 / 255, 34 / 255, 1
            theme_icon_color: "Custom"
            icon_color: 1, 192 / 255, 34 / 255, 1
            adaptive_width: True

            on_press:
                video_player.state = 'stop'
                player_widget.getVideoFolder(video_player.source)
            on_release: app.root.current = player_widget.return_to

        BoxLayout:
            VideoPlayer:
                id: video_player
                allow_fullscreen: True
                source: app.video_path
                state: 'play'
        Widget: