Using the Coandă effect, it is theoretically possible for an aircraft's engines to blow enough air over the wing to generate lift.
However, in a real aircraft the engines are placed so as not to place the complete wing within their outflow. Otherwise, a large amount of drag would be constantly produced during forward flight. Engine outflow also does not have sufficient cross-section to affect the complete wing, unless a very stubby (small aspect ratio, not very efficient) wing was used.
Applications have been seen in prototypes such as the Boeing YC-14 or production models such as the Antonov An-72, however these were STOL aircraft, not VTOL.