i followed the and the video does not appear on the screen
To my fellow blender 4.0, remember to set emission to 1, for some reason mine was set to 0 and was not emiting anything, obviously...
Indeed Hernan rrafeeder thank you!
In the new Principled BSDF in 4.0, the default for Emission has been changed from black Color and Strength of 1, to a white Color with a strength of 0.