Easy method: 1. v1: locked off shot of scene sans people. 2. v2: shot with people add: effects, time, pick one (echo, trails etc…, have fun. 3. adjust opacity of v2 and cut to change time relationships of people placement.
old school: 1. v1: lock shot of scene sans people. 2. v2: same shot with people. 3. in motion tab, motion blur and adjust to taste. 4. add some channel offset for yucks. 5. adjust opacity of v2. 6. slice up v2 image to effect people jumping forward in time.
I’m absolutely sure there are many, many other ways. The secret is explore and have fun. Chances are you’ll find the “next cool effect”.
Also, realize there are many ways to do these things…many involving pre planning during the shooting stage of the game. Directors who exclaim loudly “We’ll fix it in post” often don’t realize the fix they’ve gotten themselves into.