Is it possible to take, for example, this videoand somehow make dr. Manhattan's skin yellow/white? instead of blue? Is it possible to take out his figure/delete the surroundings? If yes, then how?
One way to achieve cutting out the background is by using after effects and rotoscoping Dr. Manhattan out - there are many tutorials online on how to rotoscope. Adobe After Effects CS5- Rotoscope with Rotobrush
Once you've done this, grade Dr. Manhattan to your liking by using a colour correction tool such as levels, and hue/saturation. You may have to rotoscope in/out the colours you want to keep.
Hope this is helpful.
You can also use DaVinci Resolve.
First node: You can use a qualifier to get the basic outline of Dr. Manhattan (not the glow around him, but the darker blue parts).
Second node: You can feed one output from that first node through hue vs. hue to convert blue to yellow.
Third node: You can feed another output from the first node to a mask.
Fourth node: You can then then blur the mask (outside only, not inside and outside) and tint it to make your yellow glow.
Fifth node: you can use the mask of the 3rd node to select the output of the second node and composite that with the output of the fourth node to get a yellow body with a yellow glow, and no background.