How to access camera on an AWS EC2 instance(g4dn.xlarge) for my FastAPI backend in the webapp?

I built a web app with ReactJs as front end and FastAPI as back end. With the below-mentioned FastAPI code, I was able to access to webcam and capture users' facial expressions and run some ML algo on the recorded video. The code was working fine on my local machine on Mac.

cap = cv2.VideoCapture(1)

    with mp_holistic.Holistic(
        min_detection_confidence=0.5,
        min_tracking_confidence=0.5) as holistic:
        while cap.isOpened() and not stop_event.is_set():
            success, image = cap.read()
            if not success:
                continue
            
            image.flags.writeable = False
            image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
            results = holistic.process(image)

            
            image.flags.writeable = True
            image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
            
            
            mp_drawing.draw_landmarks(
                image,
                results.face_landmarks,
                mp_holistic.FACEMESH_CONTOURS,
                landmark_drawing_spec=None,
                connection_drawing_spec=mp_drawing_styles
                .get_default_face_mesh_contours_style())
            
             if(results.face_landmarks == None):
                number_of_frames_with_no_face += 1
            else:
                number_of_frames_with_face += 1
                number_of_frames_with_face_periodic += 1
cap.release()
cv2.destroyAllWindows()

Now when I am running the same code on an EC2 Ubuntu instance(Instance type - g4dn.xlarge as I was told that it is required for GPU), I am getting the below error.

Aug 12 17:38:45 ip docker[769]: back_end-web-1  | INFO: - "GET /analysis/start?param=presentation&user_id=54 HTTP/1.1" 200 OK
Aug 12 17:38:45 ip docker[769]: back_end-web-1  | [ WARN:0@132.006] global cap_v4l.cpp:982 open VIDEOIO(V4L2:/dev/video1): can't open camera by index
Aug 12 17:38:45 ip docker[769]: back_end-web-1  | [ERROR:0@132.006] global obsensor_uvc_stream_channel.cpp:156 getStreamChannelGroup Camera index out of range
Aug 12 17:38:46 ip docker[769]: back_end-web-1  | INFO: Created TensorFlow Lite XNNPACK delegate for CPU.
Aug 12 17:38:46 ip docker[769]: back_end-web-1  | [ WARN:0@132.241] global cap_v4l.cpp:982 open VIDEOIO(V4L2:/dev/video1): can't open camera by index
Aug 12 17:38:46 ip docker[769]: back_end-web-1  | [ERROR:0@132.241] global obsensor_uvc_stream_channel.cpp:156 getStreamChannelGroup Camera index out of range
Aug 12 17:38:46 ip docker[769]: back_end-web-1  | ALSA lib confmisc.c:855:(parse_card) cannot find card '0'

When I checked the machine with v4l2-ctl --list-devices command, I got the response Cannot open device /dev/video0, exiting..

Questions -

1. Would The logic(of accessing webcam of user using webapp) even work on an AWS cloud?
2. If yes, then what configuration changes do I need to make to me EC2 instances so that the backend can access user's webcam and start analysis?