Set default model in HuggingFaceMedia

Improve handling of shared chats
Show api_key input if required

etc/examples/video.py

@@ -0,0 +1,19 @@
+import g4f.Provider
+from g4f.client import Client
+
+client = Client(
+    provider=g4f.Provider.HuggingFaceMedia,
+    api_key="hf_***" # Your API key here
+)
+
+video_models = client.models.get_video()
+
+print(video_models)
+
+result = client.media.generate(
+    model=video_models[0],
+    prompt="G4F AI technology is the best in the world.",
+    response_format="url"
+)
+
+print(result.data[0].url)