Many videos of slaughterhouse practices exist although this one is unique because it also shows the reactions of people watching the video. Their faces tell as much of a story as the actual footage inside the slaughterhouse.
If you have a strong stomach and can deal with graphic scenes of animal torture then keep watching after the 1 minute 33 section mark. Text shows up on the screen at that point so you have a couple of seconds to stop the video.
If you eat meat, try to make yourself watch the whole video. This is what happens to a helpless harmless animal so you can enjoy your perfectly cooked steak. Maybe this will change your mind and you will go vegan.