This is the New York State official video explaining Grand Jury procedure, aimed for those who have just been selected to sit on such a jury.
It begins with an explanation & contextualization of the Grand Jury System, and then focuses on the step-by-step procedure that a juror will go through as the prosecutor presents a criminal indictment to them.
The film was made by documentarian Ted Steeg, who produced other legal instruction & jury duty films as well.