Hi!
1) yes the camera is on a glide track moving from left to right with a slight pan of the camera to keep my subject centred.
2) there is a person sat in the foreground at a desk! he remains pretty still so im quite confident i could rotoscope him!
3) I have the background already in the shot unfortunately! not shot on a green screen!
4) the main problem im having is when I use the 3D camera tracker on AE, the camera movement is causing the trapcode particles to fall diagonally as opposed to straight down! As you can see by the video I attached, I would like them to fall straight down!
If you need any more info please let me know!
Any help would be really appreciated!