Well, first of all, you need a TV, video streaming device or set-top cable or satellite box that has Bluetooth. You connect a Bluetooth speaker just like you do Bluetooth earbuds: through the Bluetooth settings menu on your TV or those aforementioned devices (Apple TV, for instance, has Bluetooth connectivity, making it easy to connect your AirPods).  The only issue with connecting a Bluetooth speaker to your TV is that there can be some audio-video syncing issues due to Bluetooth lag. In some cases, where your Bluetooth speaker has an audio input (a few high-end Bluetooth speakers even have digital audio inputs), you can use a wired connection to the speaker via the audio outputs on your TV.  Soundbars tend to use the optical or HDMI connection on your TV to get sound. Many soundbars have a Bluetooth option so you can wirelessly stream music from your phone to the soundbar.