In a just world, the jury would not only learn of it but be shown the videos. We know the lovely happy judge is never going to allow that to happen.
Nope.
http://www.law.cornell.edu/rules/fre/rule_404
) Exceptions for a Defendant or Victim in a Criminal Case. The following exceptions apply in a criminal case:
(A) a defendant may offer evidence of the defendants pertinent trait, and if the evidence is admitted, the prosecutor may offer evidence to rebut it;
(B) subject to the limitations in Rule 412, a defendant may offer evidence of an alleged victims pertinent trait, and if the evidence is admitted, the prosecutor may:
(i) offer evidence to rebut it; and
(ii) offer evidence of the defendants same trait; and
(C) in a homicide case, the prosecutor may offer evidence of the alleged victims trait of peacefulness to rebut evidence that the victim was the first aggressor.