Как определить есть ли на видео человек с помощью OpenCV?

Нужно написать тело программы. Помогите пожалуйста

import cv2
cap = cv2.VideoCapture(0)

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программист любитель на python
import face_recognition
import imutils
import pickle
import time
import cv2
import os
# find path of xml file containing haarcascade file 
cascPathface = os.path.dirname(
 cv2.__file__) + "/data/haarcascade_frontalface_alt2.xml"
# load the harcaascade in the cascade classifier
faceCascade = cv2.CascadeClassifier(cascPathface)
# load the known faces and embeddings saved in last file
data = pickle.loads(open('face_enc', "rb").read())
print("Streaming started")
video_capture = cv2.VideoCapture(0)
# loop over frames from the video file stream
while True:
    # grab the frame from the threaded video stream
    ret, frame = video_capture.read()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = faceCascade.detectMultiScale(gray,
                                         minSize=(60, 60),
    # convert the input frame from BGR to RGB 
    rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    # the facial embeddings for face in input
    encodings = face_recognition.face_encodings(rgb)
    names = []
    # loop over the facial embeddings incase
    # we have multiple embeddings for multiple fcaes
    for encoding in encodings:
       # Compare encodings with encodings in data["encodings"]
       # Matches contain array with boolean values and True for the embeddings it matches closely
       # and False for rest
        matches = face_recognition.compare_faces(data["encodings"],
        # set name =inknown if no encoding matches
        name = "Unknown"
        # check to see if we have found a match
        if True in matches:
            #Find positions at which we get True and store them
            matchedIdxs = [i for (i, b) in enumerate(matches) if b]
            counts = {}
            # loop over the matched indexes and maintain a count for
            # each recognized face face
            for i in matchedIdxs:
                # Check the names at respective indexes we stored in matchedIdxs
                name = data["names"][i]
                # increase count for the name we got
                counts[name] = counts.get(name, 0) + 1
            # set name which has highest count
            name = max(counts, key=counts.get)
        # update the list of names
        # loop over the recognized faces
        for ((x, y, w, h), name) in zip(faces, names):
            # rescale the face coordinates
            # draw the predicted face name on the image
            cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
            cv2.putText(frame, name, (x, y), cv2.FONT_HERSHEY_SIMPLEX,
             0.75, (0, 255, 0), 2)
    cv2.imshow("Frame", frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
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