I'm going to direct a music video for my band (I have experience in film production, direction and some video post-production) and I want to achieve the following effect:
Film the singer at a high FPS (with a phantom hd gold) and then slow it down substantially. Then, at the same location, film the singer actually singing the song, and then in post production superimposing his face (without it being slowed down) on his own body from the previous shot. Final effect: his body and background will be moving in super slow motion but he will be singing the song at normal speed.
I'd prefer to do it in after effects since it's the software I have most experience with.
I know sometimes a similar effect is achieved by speeding up the song and the singer lip syncing to that, but in this case it would be impossible because I want film at around 1000fps and slow that down, so it would be too fast.
I wont move the camera and I know I have to take in account shadows and lighting in both takes so they match.