Looking at it closely I believe that the first video has been done using a simple case of "colour manipulation". It is in fact one continuous take. Just as the colour changes watch carefully the small red-ish object on the floor near the top right corner of the screen. It's colour also changes. I think he has just chosen a specific "colour range" and applied a change of "hue" to it, thus affecting everything in the frame which is of that colour or similar. This can be done incredibly easily in photoshop as well as video manipulation programs; you literally click on, or "sample" the object whose colour you want to change, then drag a slider to change it, and just that object or others with the same colour will change.. Everything else in the photo/video will remain completely untouched. The second vid probably uses the same technique.
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