app.py

import gradio as gr

def return_yt_html_embed(yt_url):
    video_id = yt_url.split("?v=")[-1]
    HTML_str = (
        f'<center> <iframe allowfullscreen width="500" height="320" src="https://www.youtube.com/embed/{video_id}"> </iframe>'
        " </center>"
    )
    return HTML_str

iface = gr.Interface(fn=return_yt_html_embed, inputs="text", outputs="html")
iface.launch(share=True)