Video edition

I make augmented reality apps. To showcase them, I make 2 types of videos, I have videos recorded directly from the cell phone's screen, and I have videos recording the person that is holding the cell phone. I want to mix these videos together and also add effects. Fast forwarding, transitions, background music, etc. I'd like something like this but much better, to be added to my website: https://www.youtube.com/watch?v=aFWEXb4lvFA&t=5s

Please let me know how many minutes of edited video you can provide for the first $100, even though the project will be bigger, so I can have an idea of your rates.

Please send samples of past work.

Best,
Carlos.