Invisibility
Invisibility is achieved by many predators in oceans and terrains, people rarely know about except the famous chameleon which is typically a color changing guy and not invisible. Examples include Mimic octopus, seahorse, cephalopods, pacific tree frogs and more. The main machanism behind this is mostly camouflage, in case of cephalopods, their skin gets invisible, but others also changing color morphs with a change in background brightness. Coloration can be changed in milliseconds as they adapt to their environment and the pigment cells are expandable by muscular contraction. Color change is used as an expression of the physiological condition, as a social indicator and most commonly ambush attacks. However perfect invisibility wouldn't be possible if we transfer their genes to humans because at first these animals at maximum of transparency, are translucent and don't achieve 100% invisibility but some may reach up to 80%. According to the laws of physics, a perfectly invisible person would necessarily be blind, no matter how their invisibility were achieved, To see light, the retina must absorb it, but for a person to be invisible, the body must not absorb or reflect light. So, to retain sight, at least pupil sized holes in the cloak would be necessary in front of the pupils and directly behind them on the back of the person as light isn't being transmitted through. So yes, invisibility if we get all those genes inserted from cephalopods; can be achieved but at least a pair of dots would still be necessarily visible because we like to see.