I still am having zero luck finding a player like the one on the S5. I liked the picture capture function and even more importantly the ability to move forward or backward just one frame.
I cant help you with moving forward or back by one frame but you could always pause your video and screenshot it (Hold down Power+home button) Of course this method isn't as convenient as a screen capture button
Additionally, You could download a ported APK of the GS5 Video Playerif you have root access. (You need root access to delete the newer video player in order to install the GS5 Video Player.