Apple doesn't provide this feature because it would be used for pirating movies. BUT, you can buy a device that sits in between your TV and your AppleTV to do just that. It's called HDMI Capture.
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I understand that recording Apple TV’s screen would be very certainly used for piracy; I was hoping that since the video feed is coming from the iPhone it shouldn’t be a problem though.
Thanks for your reply. I will look into getting a HDMI capture thing.
It's possible - yes, but it's usually not easy due to DRM issues.
The Quicktime Player app on the Mac can record the Apple TV screen - you need to connect a Mac to the TV using a USB cable. There might be DRM in the music video which will disable that feature. It will probably need to be a relatively expensive USB cable, cheap ones are unlikely to run at high enough bandwidth.
You can buy a "HDMI Capture" card for a desktop PC - such as this one: https://www.blackmagicdesign.com/products/decklink/techspecs/W-DLK-39 but that's also not guaranteed, again DRM can disable it.
There are likely ways to get around the DRM, but I don't know much about htat.