If this is hard to visualize, imagine the subject walks from left to right in front of a crowded street. With the subject removed, you now have a "hole" in your image that moves from left to right. When you place the slowed-down subject back in the picture, you will need to find something else to cover up that hole. This would be easy if the background wasn't moving, but very difficult if anything else moves.
You could do it rather easily, however, if you had a keyed source. For instance, you could film the subject walking across a totally empty street, then cue your crowd and film the scene again without the subject, then use pattern keying to overlay the subject on the crowd at any speed you like.
This question reminds me of Michel Gondry's work. He has figured out a lot of amazing ways to do things cheaply and quickly with video. Google his name for some interesting reading.How do I make it so that a person is slow motion on a video but the background is normal?You can do the reverse, in stop motion effect. Have the subject stand still while the background is doing its thing, if you stop motion it you will get that affect, or you can even make it in fast motion since the person is standing still, it wont affect them foreground as much as the background.How do I make it so that a person is slow motion on a video but the background is normal?Easiest method is chroma key (green screen)
Film the background normally and then flim your person in front of a greenscreen, and with the correct software you can place your person on top of the background, remove the green from the video meaning your subject will be on top of your background video and with editing techniques make him slow motion
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