Trying to make a demo, does this work?

app.py

@@ -1,52 +1,17 @@
-import importlib
 import gradio as gr
 import os
-import sys
-import copy
-import pathlib
-from fastapi import FastAPI, Request
-from fastapi.templating import Jinja2Templates
-import uvicorn
-from gradio.utils import get_space
 
-os.environ["GRADIO_ANALYTICS_ENABLED"] = "False"
+a = os.path.join(os.path.dirname(__file__), "files/a.mp4")  # Video
+b = os.path.join(os.path.dirname(__file__), "files/b.mp4")  # Video
+w1 = os.path.join(os.path.dirname(__file__), "files/w1.jpg")  # Watermark
+w2 = os.path.join(os.path.dirname(__file__), "files/w2.png")  # Watermark
 
-demo_dir = pathlib.Path(__file__).parent / "demos"
+def generate_video(original_video, watermark_file):
+    return gr.Video(a, watermark_file=watermark_file)
 
 
-app = FastAPI()
-
-templates = Jinja2Templates(directory="templates")
-
-names = sorted(os.listdir("./demos"))
-
-
-@app.get("/")
-def index(request: Request):
-    names = [[p[0], p[2]] for p in all_demos]
-    return templates.TemplateResponse("index.html", {"request": request, "names": names,
-                                                     "initial_demo": names[0][0], "is_space": get_space()})
-
-
-all_demos = []
-demo_module = None
-for p in sorted(os.listdir("./demos")):
-    old_path = copy.deepcopy(sys.path)
-    sys.path = [os.path.join(demo_dir, p)] + sys.path
-    try:  # Some demos may not be runnable because of 429 timeouts, etc.
-        if demo_module is None:
-            demo_module = importlib.import_module(f"run")
-        else:
-            demo_module = importlib.reload(demo_module)
-        all_demos.append((p, demo_module.demo.queue(), False))
-    except Exception as e:
-        with gr.Blocks() as demo:
-            gr.Markdown(f"Error loading demo: {e}")
-        all_demos.append((p, demo, True))
-
-for demo_name, demo, _ in all_demos:
-    app = gr.mount_gradio_app(app, demo, f"/demo/{demo_name}")
-
+demo = gr.Interface(generate_video, [gr.Textbox(), gr.File()], gr.Video(),
+                    examples=[[a, w1], [b, w2]])
 
 if __name__ == "__main__":
-    uvicorn.run(app, port=7860, host="0.0.0.0")
+    demo.launch()