Many if not most if not all Samsung Smart TVs have a hidden menu where you may be able to enable Bluetooth headphones. With the TV off, click Mute-1-8-2-TV (power) in rapid succession. If you do it quickly enough, it should open to a double-secret configuration menu, where you have to enable Bluetooth support twice.
The first is Option|MRT Option|BT Support, and the second is Option|Engineer Option|BT_AUDIO_ON_OFF, both of which you set to ON. Then turn the TV off.
If your TV has these menu options and you set them on, you should then be able to turn the TV back on, go to MENU|Sound|Speaker Settings|TV Sound Output and select Bluetooth Headphones. Then go down to Bluetooth Headphone List, where you'll be able to pair and connect your Bluetooth headphones.
I don't know if this works on all Samsung Smart TVs, but to my considerable surprise it worked on my 4-5 year old UN65H7150.