The stock camera app doesn't allow for slow motion video shooting nor does it shoot faster than 30 FPS. You can try one of the slow motion video apps though and see how they work for you.
Also, a video shot on the Tab S2 wouldn't play back in slow motion very well. To get good quality slow motion you need to shoot at 60 FPS or faster. Like I said, the Tab S2's default video camera shoots at 30 FPS.