I know that the stopping power of most handguns sucks, relatively speaking. If you really want to stop a perpetrator good its best to use a long arm such as a rifle. However, the officer in the video was right up close to the bad guy, at hand to hand range. At that close I think most handguns would be much better at stopping somebody than from further away. The officer got in a shot to the thoracic cavity which is where you're supposed to shoot somebody if you want to stop them although you want to get in two shots, at least that's what I was taught in class. If that doesn't stop them then you take a shot to the ocular cavity which is a headshot. I think the biggest problem the officer had was that he wasn't able to get more shots in since his weapon had a malfunction. That is the thing about semi autos, they are more prone to malfunctions than revolvers. Also, although this was not covered in the classes I took, I think at that close a .357 or a .45 would be much better at stopping somebody than a 9mm and its much more likely to stop them at one shot, at least when you're that close in. And there are handguns that are good at stopping people. The .44 Magnum was created as a backup weapon for hunting dangerous game and they've been known to put down big bears, so Im quite sure they can put down a person.
There is no magic "man stopping" gun or bullet.
THERE IS NO MAGIC "MAN STOPPING" GUN OR BULLET. THERE IS NO MAGIC "MAN STOPPING" GUN OR BULLET. There are, indeed, some rounds that are more likely to do that. Any of the enhanced expansion, hollow point rounds are more likely than ball ammo to do so. But not guaranteed. In the video, the narrator describes the shot as being to the abdomen. My guess is that it was a stomach wound, not a shot to the chest. But you can't rule out will to survive. See, for example,
Officer Stacy Lim who not only survived being shot in the heart, but killed her attacker.
Malfunctions and semi-autos... Nope. Using quality ammo, and using the gun properly, a semi-auto is not any more prone to malfunction than revolver. They have more malfunctions possible -- but malfunctions in a semi-auto are generally fixable. Most malfunctions in a wheel gun leave you holding a very short, very poor club. In the video, the "jam" is not explained in detail (and the narration is certainly played up for effect...) Notice that the officer, under life or death pressure, didn't even try to resolve the problem with his gun, even though he had several seconds as the assailant lumbered over to him. My guess, though I don't know what gun he carried, is that at the contact range they were fighting, the gun was simply out of battery, and many semi-autos won't fire if they're out of battery. It also may not have cycled properly due to the dynamics of the shot taken... Easy fix, but you have to keep hold of the gun and then apply it.
By the way -- the video doesn't specify the caliber. What would your response be if you learned that they carried .45s? (Actually, I found sources saying it was a .40 Glock. Which won't fire out of battery.)
And I've found a training lesson plan regarding this incident. It describes the jam as a fail to extract/stovepipe type situation. And it says that the suspect got hold of the gun, and tried to shoot Deputy Wilson. (And specifies the would as being to the lower left abdomen.) In fact, if the narrative of the lesson plan is accurate, the voice over narrative in your video has several errors. I kind of trust the lesson plan over a highly emotionally narrative...