[Python] Combine png-images to video with alpha channel in python

My Intention was: - Extract all frames from video - Apply background removal to each frame - Merge all frames together as a video with transparency

Problem: - The resulting video doesn't have the desired transparency where the background used to be My code for the Merging-Part

import cv2
import os

image_folder = r"C:\Users\youre\Documents\machine_learning\bg-rm\output"
video_name = r'C:\Users\youre\Documents\machine_learning\bg-rm\test.avi'
images = # list of all frames
frame = cv2.imread(os.path.join(image_folder, images[0]))
height, width, layers = frame.shape
video = cv2.VideoWriter(video_name, cv2.VideoWriter_fourcc(*"MJPG"), 30, (width, height))
for image in images:
video.write(cv2.imread(os.path.join(image_folder, image)))
cv2.destroyAllWindows()
video.release()


My question: - What do I have to do in order to have my transparency over the background in the resulting video, because my code just gives me a black background. More specific: How do I merge the png-frames together with an alpha channel?

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