Update README.md

Author: leng-yue

README.md

@@ -38,9 +38,7 @@ We do not hold any responsibility for any illegal usage of the codebase. Please
 
 ## Videos
 
-#### V1.4 Demo Video: https://www.bilibili.com/video/BV1pu46eVEk7
-
-#### V1.2 Demo Video: https://www.bilibili.com/video/BV1wz421B71D
+#### V1.4 Demo Video: [Youtube](https://www.youtube.com/watch?v=Ghc8cJdQyKQ)
 
 ## Documents