I have noticed tearing in some videos, I'm not sure if it was dodgy encoding for those specific files or something to do with my software stack... But in this situation freesync might help.
Initially the ability to adjust the display refresh rate seems like it would help, such as running the monitor at 48 or 72 or 96Hz (etc) to display 24fps content in twos, threes, fours, or so on. But this is probably less important than a freesync monitor simply waiting for complete frames before it draws them.