app.py

import gradio as gr
import cv2

def greet(video):
    cap = cv2.VideoCapture(video)
    succes, img = cap.read()
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    return gray
    
iface = gr.Interface(
fn=greet, 
inputs=gr.Video(source = "webcam", format = "mp4", streaming = "True"),  
outputs="image"
)

iface.launch()