Story:
I stumbled upon an option to stream youtube to samsung smart tv.
Requirements:
PC/Android/IOS device connected to the same network as the Samsung smart TV
Scenario for PC:
Internet browser chrome and extension for it google cast extension.
Lets say you are browsing on youtube.com videos and you wanna watch it on a big tv screen.
Just click on the google cast extension icon 
during watching a particular youtube video, shows you option to which device you want to stream.
In my case Samsung TV appeared.
Chose your TV and you are done.
Benefits:
Chromecast is not needed.
