As the title mentions, how would one go about green screening someone running?
Option 1: Rotoscoping. Mocha Hitfilm is your friend, or you can do a Google search for one of the AI/Web based rotoscoping tools starting to emerge.
Option 2: A really, really big greenscreen.
Option 3: Steal a page from Robert Rodriguez when he made Sin City. Greenscreen and treadmill.
Yes, and if you use @Triem23 's 3rd option What I tend to do is boost the saturation of the greens (Hue Saturation and Lightness effect>. green> Saturation> 100) and sometimes play with the lightness but this is so the green stands out more since there will be more motion blur
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