Open windows movie maker and take any video which has the background of same color. Drag and drop the video on to the time line. Then go to tools > video transitions and take the chroma key and drop it between the two videos. The chroma color should correspond to the background color of the video. After this, save the movie file. To pick the right color for the background, download Debug mode wax. This will help in creating some home videos with special effects.
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