Question Discuss: How to animate an object at a specific frame rate?

I recently saw a video that can animate a unity object at its own frame rate independently from the game's frame rate(0:00~0:20 in the video). I'm looking for the same effect in my game because I want to animate my characters at 8fps or 12fps to achieve a hand-drawn feel. Does anyone has any idea about how I can achieve this technique? Thanks a lot!