Music video concepts

This video was simply a test of multiple post production techniques that can be used in adobe after effects. It demonstrates the effect i am trying to create for my music video "I wasn't ready - Rarestspun", the desired effect is that of a TV or computer screen displaying an image/video that was not present in the initial shoot. This video clearly demonstrates a look that can be achieved.

Another effect present in this video that would be desired in my music video is "selective colour", this allows only one colour range to be viewed within any single frame; meaning either, only that element or coloured item is visible in the shot, or that the shot is completely de-saturated apart from the selected element.