Get data from Arduino and displaying video with cv2 - Python

Question

I am working on a project where I get the roll data from the accelerometer in Arduino and then group the rotation in terms of 1 and 0, 1 means that the previous roll value is different from the updated roll value, and 0 means that it is the same as the previous. So if it displays 1 the video will appear and if 0 the video will pause. However, I am not sure how to go about it and faced issues in making the video play and pause. Would greatly appreciate your help thankyou!!

Python code

import cv2
import serial
try:
  arduino=serial.Serial("COM5", timeout=1)
except:
  print("Check port")

    def whileloop():
      rawdata=[]
      decode_data=[]
    while True:
        decode_data.append(arduino.read())
        for i in decode_data:
            rawdata.append(i.decode("utf-8"))
        print(rawdata)
        if len(rawdata)==10:
             if rawdata.count("1")>=1:
                cap=cv2.VideoCapture("test.mp4.mp4")
                while(cap.isOpened()):
                   ret,frame=cap.read()

                   cv2.imshow("video",frame)
                   if cv2.waitKey(10)==ord('q'):
                     whileloop()
                            
            elif rawdata.count("0")>rawdata.count("1"):
                cv2.waitKey(10)
                break
            else:
              whileloop()

    rawdata=[]  
    whileloop()
whileloop()

Arduino Code

int x,y,z,roll;
int prev = 0;
const int relay_3v3_pin=3;
void setup() {
pinMode(relay_3v3_pin,OUTPUT);
Serial.begin(9600);
}

void loop() {
x = analogRead(A0);
y = analogRead(A1);
z = analogRead(A2);
/*Serial.print("acceletation in x, y, z direction: ");
Serial.print(x);
Serial.print(" ");
Serial.print(y);
Serial.print(" ");
Serial.println(z);*/


if (roll==prev)
  { digitalWrite(relay_3v3_pin, LOW);
  
  delay(300);roll = ( ( (atan2(y,z) * 180) / 3.14 ) + 180 ); /* Formula for roll */

} else {
  prev=roll;
  digitalWrite(relay_3v3_pin, HIGH);
  delay(100);
  
}

if (roll==prev)
  { digitalWrite(relay_3v3_pin, LOW);
  Serial.print(0);
  delay(50);
} else {
  digitalWrite(relay_3v3_pin, HIGH);
  Serial.print(1);
  prev==roll;
}
delay(200);
}