In order to get to the “Slow motion” feature: as you open the camera app, swipe the finger from left to right on the screen, that will bring up the different camera setting, select the “Slow motion”selet "Slow motion" from camera mode setting
That will bring you to the video camera. When you record, the camera will record action at 240fps (240 frames per second). When you play back the video, the Samsung gallery app allows you to select the video playback speed as low as 1/8of the recording speed (at 30 fps), basically that will make the video to be slower than the actual scene.
I made a sample video recording in slow motion and upload onto YouTube here: