I see that my problem is known, but it was supposed to be fixed in the last updates. I am using Unity 2019.4.9f1 and Vuforia 9.8 on Windows 10.
I have only one image target and one cube attached to it, I press Play, it works sometimes, I press Play second time, it crashes Unity. Sometimes it will work for a couple of times, sometimes it crashes from the first Play.
I have the webcam profile correctly setup, the privacy is allowed for Unity, I use ony the Windows security defender which it's not blocking Unity.
It is something that is blocking the development process and I cannot find a fix for it. This issue is raised by users since Unity 2018, but is still here.
I am attaching the editor log files, maybe it will help.