How does "spillover", the phenomenon by which the coronavirus passed from animals to humans, occur?

How pathogenic microorganisms jump from one species to another, how often this happens, and what circumstances are necessary for the process to be successful, find out in the special edition 60'' ABOUT CORONA from veterinary infectious disease specialist Prof. Dr. Lejla Velić. You can follow the series on the YouTube channel "60 Seconds About Corona," as well as on the Facebook page @BHAAAS and Instagram @bhaaas_usa_bih. The series is supported by the Government of Switzerland. The content of the publication, as well as the findings presented in it, do not necessarily reflect the views of the Government of Switzerland. 

https://www.youtube.com/watch?v=WqKqoj5UDTU