How to setup a USB camera on RPi

[shekarpathi]

I have a Pi2 running the latest Bullseye OS.
I have two USB cameras attached to this PI. How do I setup/configure camera.py to make it stream so that I can watch the camera feed from my iPhone using Homekit
I have installed ffmpeg also.

[fwebcc]

def get_bridge(driver):
bridge = Bridge(driver, 'Bridge')
size=len(mqtt_conf["list"])
for i in range(0,size,1):
if str(mqtt_conf["list"][int(i)]["mode"])=='camera':
v_type=mqtt_conf["list"][int(i)]["cmdoff"]
v_code=mqtt_conf["list"][int(i)]["Subscribe"]
v_ip=mqtt_conf["list"][int(i)]["cmdon"]
v_add=mqtt_conf["list"][int(i)]["Publish"]
options['start_stream_cmd']=v_ip
options['start_stream_cmd']=(
'ffmpeg -re '+v_type+' -i '+v_add+' -threads 4 '
'-vcodec '+v_code+' -an -r {fps} '
'-f rawvideo -tune zerolatency '
'-vf scale={width}x{height} -b:v {v_max_bitrate}k -bufsize {v_max_bitrate}k '
'-payload_type 99 -ssrc {v_ssrc} -f rtp '
'-srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params {v_srtp_key} '
'srtp://{address}:{v_port}?rtcpport={v_port}&'
'localrtcpport={v_port}&pkt_size=1378')
acc = HAPCamera(options, driver, mqtt_conf["list"][int(i)]["title"])
bridge.add_accessory(acc)
return bridge

class HAPCamera(camera.Camera):
def get_snapshot(self, image_size):
with open(os.path.join('./snapshot.jpg'), 'rb') as fp:
return fp.read()