This particular TV model (un70nu6070fxza) does not have Bluetooth connectivity.
There is even more disappontment for me.
I found that it doesn't support wireless keyboards. I have Logitech K400r keyboard that only works with a minimum functionality with this TV i.e. cursor buttons, Enter button but no QWERTY buttons work. I did not try a new Logitech keyboard model (K400Pro) with this TV yet.