Hello,
I am a professional video editor and I professional edit videos of all kinds, I believe I may be able to help you with what you require very quickly.
I advise not to edit on iMovie as the app isn't very powerful with many limitations, I professionally edit on Final Cut Pro X so I can complete what you require without the need of iMovie.
Message me if you agree with my proposal, you shall receive what you require quickly.]
Thanks.
Ahsan Minhas