YouTube adds additional feature to the users to view video’s in offline mode .
How to access this feature ?
Just open your YouTube application as usual and search the video that you want to view. And tap that video to access other options of that video
To view video in offline mode just click on the offline mode button (marked).
After clicking that you can access that video anytime and anywhere by menu->offline
Enjoy YouTube videos without stream !!
Note : some videos may not offer this offline feature .