With tutorial from https://www.computervision.zone/courses/3d-hand-tracking/ hand tracking that opens up a portal in unity

Hand tracking is done using python, OpenCV, and CVZone (see 3DHandTracking.py).

The data is sent to unity. Unity receive (see UDPReceive.cs)

Circling hand movement is recognized (see CircleRecognizer.cs)

Portal is opened up (see PortalManager.cs)