For fix-wing aircraft, the pressurized air can travel from the engine through the wing and into the cabin. However, a tilt-wing aircraft, such as the CL-84 Dynavert (shown below), will have its wings "detach" from its fuselage. How would such an aircraft send pressurized air to the cabin?
It's pretty easy. Flexible ducting is readily available. Of course yours would twist in torsion, but it doesn't have to. It can be arranged to bend instead.
The wings are held on by a big, tough horizontal spar. It's round because the wing rotates on it. It's hollow because that's strongest for weight. Thus you are guaranteed to have a big, hollow, round pipe running from the fuselage to at least the mid-wing.
If the bearings could be sealed from blow-by, or if some leakage of bleed air through the bearings is tolerable, the bleed air could be run directly down the hollow spar. Otherwise the spar could be "sleeved" with a plastic tube, which is designed to be OK with 90 degrees of torsion over 15 or so feet of its length. The torsion of the tube would be spread down its entire length, which isn't asking a lot.
This is done in the engineering world all the time, using something called a rotary seal. installing one of these in a pipe allows the ends of the pipe to rotate relative to each other without losing pressure in the pipe.
Rotary seals also are used anywhere a rotating power shaft emerges from a gearbox or an engine block that has oil under pressure inside it, to prevent the oil from squirting out of the shaft hole.