How to move image inside a video

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This code is working fine. output of below codeIt creates a noise video and moves a circle inside the video from left to right. But I want to do a different thing. I want to add moving images not a circle. Further says I have to create a video. Inside the video, I have to move images from left to right like the circle of the above code. I am a beginner to opencv and python. Could someone please help for giving some advises or references to reach my final outcome.

import numpy as np
import cv2
from cv2 import VideoWriter, VideoWriter_fourcc

def main2():
    width = 1280
    height = 720
    FPS = 24
    seconds = 10
    radius = 150
    paint_h = int(height / 2)

    img = cv2.imread('./before/mother.jpg')

    fourcc = VideoWriter_fourcc(*'MP42')
    video = VideoWriter('./circle_noise.avi', fourcc, float(FPS), (width, height))

    for paint_x in range(-radius, width + radius, 6):
        frame = np.random.randint(0, 256,
                                  (height, width, 3),
                                  dtype=np.uint8)
        cv2.circle(frame, (paint_x, paint_h), radius, (255, 255, 255), -1)
        video.write(frame)

    video.release()