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I was able to solve the problem. I just need to figure out how to loop:

import numpy as np
import cv2
cap = cv2.VideoCapture('C:\Sample3.mp4')

def rescale_frame(frame, percent=30):

    width = int(frame.shape[1] * percent/ 100)
    height = int(frame.shape[0] * percent/ 100)
    dim = (width, height)
    return cv2.resize(frame, dim, interpolation =cv2.INTER_AREA)

while True:
    ret ,frame = cap.read()
    if type(frame) == type(None):
        break
    frame25 = rescale_frame(frame, percent=25)
    cv2.imshow('frame25',frame25)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()