How to shoot greenscreen without having a greenscreen and use that inside 3DVista virtual tour

No greenscreen? No problem, create a Zoom account and start a meeting by yourself, setting a virtual background with a green image and start recording the meeting.
No webcam? Use your phone as a webcam with Droidcam and a usb cable and connect that to Zoom.

Then use chroma key inside 3DVista and voilà!