Virtual reality system using mixed reality and implementation method thereof

A virtual reality system using mixed reality, comprising:

• a chroma-key environment booth in which a chroma-key screen is formed in a space corresponding to a viewing range of a user;
• a depth camera unit installed on an upper surface of the chroma-key environment booth and capturing the user and generating depth image information;
• an HMD device in which a stereoscopic camera worn on a head of the user and performing capturing at positions corresponding to both eyes of the user is positioned, and a head tracking marker is positioned on an upper end of the stereoscopic camera, and which is configured by an HMD output unit outputting an image onto planes corresponding the both eyes of the user;
• and
• a mixed reality processing device detecting the head tracking marker positioned in the HMD device by receiving the depth image information and detecting a position and a rotation value of the head of the user in an actual environment, applying the detected position and rotation values to a virtual reality rendering camera for virtual reality generating output image information output to the HMD device to correspond to the position and the rotation value, and overlaying image information for a body of the user, which is captured by the stereoscopic camera on the output image information.