Render levitating stones into a stock footage movie

I need a realistic Stones are flying render (cinema 4d etc.) into a stock footage video. It should look realistic like here for example [login to view URL] I have stock videos, without stones, but i need you to create the stones animation into this stock video... and needs to be realistic. So you need to render especially for the stock video. Before i hire i need to see your expertise and if you really can do it, by creating a sample for me. So here is the footage video attached, where i need to have some stones flying - levitating from the ground up... Pls create a sample (doesnt have to be perfect) and send, so i can check, thanks (video is attached)