If you were viewing your videos locally and didn’t have file sharing active (you would need to check that in System Preferences) you should be fine. If file sharing was on, you are still probably fine. I can’t speak for IT at your work, but for the most part IT has other things to worry about that takes preference over an employee watching a few minutes of something mildly inappropriate. If it was something wildly inappropriate and someone noticed, you would have probably heard about it by now. Personally, I would keep my mouth shut about this unless someone brings it up and stop watching inappropriate videos at work. Stick to cat videos if you have to kill some time.