update: complete dataset card

README.md

@@ -87,7 +87,7 @@ Watch a short demonstration of the motion capture data in action:
   Your browser does not support the video tag.
 </video>
 
-<video src="https://raw.githubusercontent.com/ChingmuData/CMRD/assets/jibengongjia.mp4" controls muted preload="metadata" width="100%" style="border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1);">
+<video src="https://github.com/ChingmuData/CMRD/raw/refs/heads/main/assets/jibengongjia.mp4" controls muted preload="metadata" width="100%" style="border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1);">
 </video>
 
 *Demonstration of full-body motion capture with real-time skeleton overlay and object tracking.*