I don't know anything about this video, or who is in it, but it looks to be a high school age Japanese kid that tops out at about 5'10" and weighs about 150 pounds (just slightly smaller than Tim Lincecum -- 5'11", 170 lbs). From the mearsurements that pop up on the screen, it looks like his breaking stuff is coming in at around 75 mph (120 km/h) and his fastball is hitting 89 mph (143 km/h). His slider moves so much it looks like he's throwing a wiffle ball. As far as I can tell he also throws a fastball with some kind of cutter variation, as well as a decent curve, but my favorite is definitely the slider. Fun stuff. Thanks YouTube.