Is there any way to film a video in your garage and add a background with a computer?
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They sell dropcloths for greenscreen. Then your video editing software should be able to run two video tracks on a stacked timeline. You would put the chroma filter on the top track and then render the two tracks into one. The advantage with cloth is it will absorb shadows better. But, you could use cheap paint or posterboards with bright lights also.
google chroma-key cloths
Just get a bright blue or green background (not red as its too close to skin tone).
Then load your footage into something like Adobe Premiere and use the Chroma-key feature whereby the software replaces a colour of your choice (the blue of green) with any computer generated image, photo, or video
Its very easy to do.