This Face Detection code is built on using HaarCascade Classifier which will detect eyes and Face You will need Python to implement this code!! You should also install libraries numpy,opencv for this!! Which you can install it via pip-install command on your terminal

facedetect.py

import cv2
face_cascade=cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

eye_cascade=cv2.CascadeClassifier('haarcascade_eye.xml')

cap=cv2.VideoCapture(0)

while True:
    ret,img=cap.read()
    gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
    faces=face_cascade.detectMultiScale(gray)

    for(x,y,w,h) in faces:
        cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
        face_gray=gray[y:y+h,x:x+w]
        face_color=img[y:y+h,x:x+w]

        eyes=eye_cascade.detectMultiScale(face_gray)
        for(ex,ey,ew,eh) in eyes:
            cv2.rectangle(face_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)

    cv2.imshow('img',img)
    k=cv2.waitKey(30) & 0xff
    if k==113:
        break

cap.release()
cv2.destryAllWindows()