Compositing and chroma key effects are in play here. Briefly, you record the bottle first, then record your subject who is going to be trapped inside with a green wall behind them. Then, in the compositing software (or possibly your editing software, depending on how powerful it is) you place the person on one track, the bottle on another track, and then remove the green wall through the software to leave the bottle in the background. Then do some tweaking to make it look believable. There's not a lot more to it, but it's one of those things where it looks better every time you do it, since you get more experience.