Quite the momentous event, some 22 years after the NFL started using it.
For now, video will be used only on so-called "boundary calls," such as determining whether fly balls went over the fence or whether potential home runs were fair or foul.
Video will be collected at the office of Major League Baseball Advanced Media in New York. If the crew chief at a game decides replay needs to be checked, umpires will leave the field, technicians at MLBAM will show umpires the video and the crew chief will make the call.
Didya note the incredibly conspicuous "for now" in that opening sentence? I sure did. Who let that elephant in the room? Shoo!