my.kv

<MyWidget>:
    orientation: 'vertical'
    id: Parking Pixels
    markup: True
    video: video_widget.__self__
    Video:
        id: video_widget
        source: 'background.mp4'
        options: {'fit_mode': 'contain'}
        state: 'play'
        options: {'eos': 'loop'}
        allow_stretch: True
        size_hint: (1, 1)

    Label:
        id: title_label
        markup: True
        text: '[font=times]PARKING \nPIXELS[/font]'
        font_size: '70sp'
        bold: True
        color: (1, 1, 0, 1)  # Yellow color
        pos_hint: {'center_x': 0.5, 'center_y': 0.7}
        halign: 'center'

    MDRoundFlatButton:
        id: btn1
        text: '[font=times]Select Video[/font]'
        size_hint: (0.2, 0.05)
        md_bg_color: (1, 1, 0, 1)  # Yellow color
        text_color: (0, 0, 0, 1)  # Black text color
        font_size: '20sp'
        pos_hint: {'center_x': 0.5, 'center_y': 0.3}
        background_color: (1,0,0,1)
        on_press: root.select_video()

    MDRoundFlatButton:
        id: btn2
        text: '[font=times]Add Region[/font]'
        size_hint: (0.2, 0.05)
        md_bg_color: (1, 1, 0, 1)  # Yellow color
        text_color: (0, 0, 0, 1)  # Black text color
        font_size: '20sp'
        opacity: 0
        disabled: True
        pos_hint: {'center_x': 0.5, 'center_y': 0.2}
        on_press: root.set_region()

    MDRoundFlatButton:
        id: btn3
        text: '[font=times]Detect[/font]'
        size_hint: (0.2, 0.05)
        md_bg_color: (1, 1, 0, 1)  # Yellow color
        text_color: (0, 0, 0, 1)  # Black text color
        font_size: '20sp'
        opacity: 0
        disabled: True
        pos_hint: {'center_x': 0.5, 'center_y': 0.1}
        on_press: root.detect()