Need Suggestions!!

Do an online search for rotoscoping. You can use Motion for this. If you have it, you can also use Shake or After Effects. Motion will do just fine. But it's a labor intensive process. You have to draw a mask around the objects you want to be affected, and then track and adjust those masks as the objects move across the frame. If your footage is perfectly steady, you may be able to interpolate some of it. If not, you'll have to adjust the masks frame by frame. The best think you have going for you is that both the broom and the truck are next to no saturation colors. So you can feather the masks and you won't see the bleed. The tricky area will be when the broom is over the yellow part of the house, if it ever gets there. Otherwise, the snow, and the black jacket will not show the mask bleed. Good luck!

Stack the video over itself in the timeline. In the top layer, use masks to crop out just the truck and the broom then do your color correct. You'll have to animate them over time to keep up with the movement of the dolly.

That's just asking for trouble. An 8 point garbage matte in FCP will be way more difficult to work with than a b-spline mask in Motion.

Hi-
Put the completely B&W clip on V1.
Put the same clip with the broom colored, restricted by your 8-Point Garbage matte on V2.
Put the same clip with the truck colored, restricted by your 8-Point Garbage matte on V3.

Hope this helps.