Label с прозрачным bg

import sys
import vlc
from PyQt5 import QtCore, QtGui, QtWidgets, Qt
from PyQt5.QtWidgets import QLabel
class Player(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(Player, self).__init__(parent)
        self.setWindowTitle("Media Player")
        # creating a basic vlc instance
        self.instance = vlc.Instance('--no-xlib --quiet')
        self.mediaplayer = self.instance.media_player_new()
        ##########video frame
        self.videoframe = QtWidgets.QFrame(frameShape=QtWidgets.QFrame.Box, frameShadow=QtWidgets.QFrame.Raised)
        self.setStyleSheet("background-color: yellow;")
 
        if sys.platform.startswith("linux"):  # for Linux using the X Server
            self.mediaplayer.set_xwindow(self.videoframe.winId())
        elif sys.platform == "win32":  # for Windows
            self.mediaplayer.set_hwnd(self.videoframe.winId())
        elif sys.platform == "darwin":  # for MacOS
            self.mediaplayer.set_nsobject(self.videoframe.winId())
 
        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)
        lay = QtWidgets.QVBoxLayout(central_widget)
        lay.addWidget(self.videoframe)
 
        filename = "bmw_111.mp4"
        media = self.instance.media_new(filename)
        self.mediaplayer.set_media(media)
        self.mediaplayer.play()
 
        # ==============================================================================
        self.label = QLabel('Убрать Background у Labal', self)
        self.label.move(150, 150)
        # ==============================================================================
 
if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    player = Player()
    player.show()
    player.resize(640, 480)
    sys.exit(app.exec_())

        # ==============================================================================
        self.label = QLabel('Убрать Background у Labal', self)
        self.label.setAttribute(QtCore.Qt.WA_NoSystemBackground)
        self.label.setAttribute(QtCore.Qt.WA_TranslucentBackground)
        self.label.setAttribute(QtCore.Qt.WA_TransparentForMouseEvents)
        self.label.move(150, 150)
        # ==============================================================================

from PyQt5.QtWidgets import (QApplication,QWidget,QMainWindow,
QLabel,QGridLayout,QPushButton,QFileDialog,QGraphicsView, QGraphicsScene, 
QGraphicsItem, QGraphicsTextItem)
from PyQt5.QtCore import Qt,QUrl, QRectF
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtMultimediaWidgets import QVideoWidget, QGraphicsVideoItem
 
 
class View(QMainWindow):
    def __init__(self,parent=None):
        super().__init__(parent)
        
        self.view = QGraphicsView()
        self.scene = QGraphicsScene()
        self.view.setScene(self.scene)
        self.setCentralWidget(self.view)
 
        self.video = QGraphicsVideoItem()
        self.player = QMediaPlayer()
        self.player.setVideoOutput(self.video)
        self.video.setPos(0,0)
        self.scene.addItem(self.video)
        
        txt = QGraphicsTextItem()
        txt.setHtml('<font color=red><h1>Текстовая метка</h1></font>')
        txt.setFlags(QGraphicsItem.ItemIsSelectable|QGraphicsItem.ItemIsMovable)
        txt.setPos(100,100)
        self.scene.addItem(txt)
        
        self.btn = QPushButton('Open')
        toolbar = self.addToolBar('')
        toolbar.addWidget(self.btn)
        self.btn.clicked.connect(self.on_open)
        
    def resizeEvent(self,e):
        self.set_rect()
        super().resizeEvent(e)
        
    def set_rect(self):
        rect = self.view.rect()
        self.scene.setSceneRect(QRectF(rect))
        self.video.setSize(QRectF(rect).size())
        
    def on_open(self):
        fname,_ = QFileDialog.getOpenFileName(self,"Open","",'*.mp4',
        options=QFileDialog.DontUseNativeDialog)
        if not fname: 
            return
        self.player.setMedia(QMediaContent(QUrl.fromLocalFile(fname)))
        self.player.play()
        self.set_rect()
 
if __name__=="__main__":
    app = QApplication([])
    w = View()
    w.resize(600,400)
    w.show()
    app.exec_()

from PyQt5.QtCore import Qt

#!/usr/bin/python3
# -*- coding: utf-8 -*-
import os, sys
from PyQt5 import (
    QtCore,
    QtWidgets
    )
 
class Background_probe(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Background_probe, self).__init__(parent)
        p_btn = QtWidgets.QPushButton('Нажми на кнопку')
        v_box = QtWidgets.QVBoxLayout()
        v_box.addWidget(p_btn)
        h_box = QtWidgets.QHBoxLayout()
        h_box.addLayout(v_box)
        self.setLayout(h_box)
 
        p_btn.pressed.connect(self.on_pressed)
 
    def on_pressed(self):
        w_dlg = QtWidgets.QDialog(self)
        w_lbl = QtWidgets.QLabel('На окне написано слово...')
        v_box = QtWidgets.QVBoxLayout()
        v_box.addWidget(w_lbl)
        h_box = QtWidgets.QHBoxLayout()
        h_box.addLayout(v_box)
        w_dlg.setLayout(h_box)
        w_dlg.setAttribute(QtCore.Qt.WA_NoSystemBackground)
        w_dlg.setAttribute(QtCore.Qt.WA_TranslucentBackground)
        w_dlg.setAttribute(QtCore.Qt.WA_TransparentForMouseEvents)
        w_dlg.show()
        w_dlg.exec_()
 
if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
 
    mwin = Background_probe()
    mwin.show()
    sys.exit(app.exec_())

        lbl = QLabel('<font color=red><h1>Текстовая метка </h1></font>')
        lbl.setStyleSheet("QLabel {background-color: rgba(0,0,0,0);}")