It's a volume control using handsfor linux for using it you need HandTrackingModule

GestureVolumeControl.py

import numpy as np
import math
from random import randint as rn
import HandsTrackingModule as hdt
import cv2 as c
import time
from subprocess import call
#from ctypes import cast, POINTER
#rom comtypes import CLSCTX_ALL
#from pycaw.pycaw import AudioUtilities, IAudioEndpointVolume
wCam,hCam= 720,640
cap = c.VideoCapture(0)
cap.set(3,wCam)
cap.set(4,hCam)
ctime = 0
ptime = 0
HDT=hdt.HandDetect(detectC=0.7)

# devices = AudioUtilities.GetSpeakers()
# interface = devices.Activate(
#     IAudioEndpointVolume._iid_)
# volume = cast(interface, POINTER(IAudioEndpointVolume))
# #volume.GetMute()
# #volume.GetMasterVolumeLevel()
# volrange = volume.GetVolumeRange()
# volume.SetMasterVolumeLevel(-5.0, None)
while True:
    success, img = cap.read()
    img = HDT.findhands(img,False)#put false fr noy showing the lines
    lmlist =  HDT.findPosition(img)#false for not shoing dots as well
    if len(lmlist) != 0:
        #print(lmlist[4],lmlist[8])
        x1,y1=lmlist[4][1],lmlist[4][2]
        x2, y2 = lmlist[8][1], lmlist[8][2]
        cx,cy=(x1+x2)/2,(y1+y2)/2
        #print(cx,cy)
        k=(200,20,200)
        c.circle(img,(x1,y1),15,k,c.FILLED)
        c.circle(img,(x2,y2),15,k,c.FILLED)
        c.circle(img,(int(cx),int(cy)),15,k,c.FILLED)
        c.line(img,(x1,y1),(x2,y2),k,3)
        length = math.hypot(x2-x1,y2-y1)
        print(length)
        if length <50:
            c.circle(img, (int(cx),int(cy)), 15, (255,0,0), c.FILLED)
        if length > 370:
            c.circle(img, (int(cx), int(cy)), 15, (0, 0, 255), c.FILLED)
        valid = False

        while not valid:
            volume = (length/370)*100

            try:
                volume = int(volume)

                if (volume <= 100) and (volume >= 0):
                    call(["amixer", "-D", "pulse", "sset", "Master", str(volume) + "%"])
                    valid = True

            except ValueError:
                pass
    ctime = time.time()
    fps = 1/(ctime-ptime)
    ptime = ctime
    c.putText(img, f'FPS: {str(int(fps))}', (10, 20), c.FONT_HERSHEY_PLAIN, 1, (255, 255, 255), 1)
    c.imshow("Image", img)
    key = c.waitKey(1)
    if key==83 or key ==113:
        break