How to write image sequence to video using openCV and python

I have some image input from the video/webcam. I want to write a video with a sequence of images.

if prob > 70 : # Violence prob
    text_color = (0, 0, 255) # red

Here is the problem faced. If the Image got above the threshold value it should write it as a video with multiple frames.

i tried loop but it didn't works

what I am tried:

a = [1,2,3,4,5,6,7,8]
b = []
if a>=5:
   b.append(a) => 
else:
  print(normal)




 loop over frames from the video file stream
while True:
    # read the next frame from the file
    (grabbed, frame) = vs.read()

    # if the frame was not grabbed, then we have reached the end
    # of the stream
    if not grabbed:
        break

    # if the frame dimensions are empty, grab them
    if W is None or H is None:
        (H, W) = frame.shape[:2]

    # clone the output frame, then convert it from BGR to RGB
    # ordering, resize the frame to a fixed 224x224, and then
    # perform mean subtraction
    output = frame.copy()
    frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    frame = cv2.resize(frame, (224, 224)).astype("float32")
    frame -= mean

    # make predictions on the frame and then update the predictions
    # queue
    preds = model.predict(np.expand_dims(frame, axis=0))[0]
    Q.append(preds)

    # perform prediction averaging over the current history of
    # previous predictions
    results = np.array(Q).mean(axis=0)
    # i = np.argmax(results)
    i = 1
    label = lb.classes_[i]
    prob = results[i]*100

    text_color = (0, 255, 0) # default : green

    if prob > 70 : # Violence prob
        text_color = (0, 0, 255) # red
    
    else:
        label = 'Normal'

    text = "State : {:8} ({:3.2f}%)".format(label,prob)
    FONT = cv2.FONT_HERSHEY_SIMPLEX 

    cv2.putText(output, text, (35, 50), FONT,1.25, text_color, 3) 

    # plot graph over background image
    output = cv2.rectangle(output, (35, 80), (35+int(prob)*5,80+20), text_color,-1)

    # check if the video writer is None
    if writer is None:
        # initialize our video writer
        fourcc = cv2.VideoWriter_fourcc(*"MJPG")
        writer = cv2.VideoWriter(args["output"], fourcc, 30,(W, H), True)

    # write the output frame to disk
    writer.write(output)

    # show the output image
    cv2.imshow("Output", output)
    key = cv2.waitKey(1) & 0xFF

    # if the `q` key was pressed, break from the loop
    if key == ord("q"):
        break
# release the file pointers
print("[INFO] cleaning up...")
writer.release()
vs.release()

How to resolve this issue. I want to write videos with multiple frames that got above threshold values.