app.py

import gradio as gr
import os

css = """
p {
    font-size: 120%;
}

li {
    font-size: 110 %;
}

.container {
    height: initial;
}

video {
    max-height: 400px;
}

.image-container {
    width: 200px; 
    max-height: 300px;
    margin: auto;
}

img {
    width: auto;
    height: auto;
}
"""


def generate_video(original_video, watermark):
    return gr.Video(original_video, watermark=watermark)

# Use RGBA image mode to preserve transparency for png images.
    with gr.Column():
            gr.Image('', visible=False)
            with gr.Column():
                gr.Image(
                        show_label=False, 
                        show_download_button=False, 
                        elem_id='example', 
                        container=False, 
                        interactive=False)
    
    with gr.Row():
        with gr.Column():
            gr.Markdown("**Inputs**: Video and watermark file")
        with gr.Column():
            gr.Markdown("**Output**: Watermarked video")
    
    gr.Interface(
        generate_video,
        [gr.Video(), gr.Image(type='filepath', image_mode=None)],
        gr.Video(),
    )

if __name__ == "__main__":
    demo.launch()