Hello, I strictly take care of the camera focus and balancing colors when I make chroma key works. i mean that just putting a photo background under a semitransparent video won't look natural and real without simulatint the cinematic camera shoot focusing. Furthermore the color levels of the video and the photo have to be the same, otherwise it ain't natural. It is needed to be mostly a video maker than a graphic designer though Photoshop leads a main role for the photos as After Effects for the quality of the chroma key filter.
I'm an advertising designer with professional background in broadcasting TV as audio/video editor, author, post producer and commercial creative/maker.
Please, take a look at my portfolio for some video samples.
I'd like to take a look at your material to estimate the final result.
My quote for 30 seconds is 70€.
And I can provide you a very few seconds sample of the final result.
Please, feel free to contact me for details.
Best regards
A. I.