It is a good idea to enjoy TV audio on your bluetooth device. The is useful especially at nights so you can watch action movies without disturbing your other family members at your home.
One way to achieve this, if your TV doesn't have built-in bluetooth is, install a bluetooth transmitter for your TV. This is an external device, which of the size of a mobile phone or even as small as a small matchbox. You can buy one at amazon or flipkart.
JL Bluetooth receiver is one of them. At this point of time, I am not able to suggest a better one than this. However, if you find more branded items (see here for the latest available bluetooth transmitters here), you can buy them too.
Listening TV on your Bluetooth headset
All you need to do is, connect the bluetooth transmitter to the headphone socket of your TV-Set. Typically all TV sets have 3.5mm headphone socket. Now switch on the transmitter device, wait for 1 minute so that the device boots and waits for pairing with a headset.
Now, turn on your headset and pair it with your new device. Once you pair, you are good to enjoy your TV audio on your bluetooth headset.