Do you mean something alon
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Do you mean something along the lines of the effect I used in
at about 1:00?
We took the action that we wanted to be in regular motion (singing) and in real time had the person sing 8 times slower than normal. We then took that footage into our editing program, and sped it up to 800% (8 times faster). The singer then appeared to be singing at a normal speed while the world around him was moving super-fast.
You simply need to isolate the action that you want in real time, and make them perform that action at a slow rate of speed, then adjust your speed in post. You can experiment with how slow or fast to get the best effect.