[Python] Pytesseract not able to extract vehicle number plate text

I have designed code to detect number plates succesfully,But problem is arising when i need to extract number plate information using pytesseteract and store it in excel,It is not extracting number plate.Tried multiple attempts but didn't work,It would be great if someone helps me out.below is the code:

import cv2
import pytesseract
from ultralytics import YOLO
import torch

pytesseract.pytesseract.tesseract_cmd = r'C:\\Program Files\\Tesseract-OCR\\tesseract.exe'

model=YOLO('C:\\users\\license_plate_detector.pt')
video_path='C:\\users\\traffic_flow.mp4'
cap = cv2.VideoCapture(video_path)

def resize_frame(frame, size=(640,640)):
return cv2.resize(frame, size, interpolation=cv2.INTER_LINEAR)

license_plates = []

while cap.isOpened():
ret,frame = cap.read()
if not ret:
break

frame_resized = resize_frame(frame)
frame_tensor = torch.tensor(frame_resized).permute(2,0,1).unsqueeze(0).float() / 255.0
results = model(frame_sensor)

for result in results:
for bbox in result.boxes.xyxy:
bbox = bbox.int().tolist()
roi = frame_resized[bbox[1]:bbox[3], bbox[0]:bbox[2]]
roi_gray = cv2.cvtColor(roi, cv2.COLOR_BGR2GRAY)
roi_thresh = cv2.threshold(roi_gray,0,255,cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]
plate_text = pytesseract.image_to_string(roi_thresh, config='--psm 8')
license_plates.append(plate_text.strip())
cv2.rectangle(frame_resized, (bbox[0],bbox[1]),(bbox[2],bbox[3]), (0,255,0),2)
cv2.putText(frame_resized, 'License Plate',(bbox[0],bbox[1] - 10), cv2.FONT_HERSHEY_SIMPLEX,0.9,(0,255,0),2)
cv2.imshow('License plate detection', frame_resized)

if cv2.waitKey(1) & 0xFF == ord('q'):
break

cap.release()
cv2.destroyAllWindows()

df = pd.DataFrame(license_plates, columns=['License Plate'])
df.to_excel('extracted_license_plates.xlsx'. index=False)




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