add example video and query

Author: szhu-bytedance

README.md

@@ -106,7 +106,7 @@ cd Vidi_7B
 bash install.sh
 ```
 
-For a given video and text query, run the following command to get the results:
+For a given video (e.g., [example_video](https://drive.google.com/file/d/1PZXUmTwUivFV_0nRhAnVR4LO9N9AAA1e/view?usp=sharing)) and text query (e.g., slicing onion), run the following command to get the results:
 
 ```
 python3 -u inference.py --video-path [video path] --query [query] --model-path [model path]