A modern laptop will run Bodypix at about 30 fps. There could be additional bottlenecks but the deep (and wide) NNs are usually not super fast, they're just fast for the wondrous things they do.

You can usually alter performance (with Bodypix that's an accuracy/speed tradeoff) or do something silly like downscale, run, and upscale the mask. I'd like to try this.