Coercing someone into sex is rape regardless of how physically "harmless" the coercion is.

Rape is usually comitted by someone the victim knows and trusted who uses their power over and/or intimate access to the victim. Like this guy did by using the intimate video he had of her to threaten her. Not all rape is done in some dangerous back alley by goons, most rape isn't. Being physically overpowered or violently attacked isn't a requirement for something to be considered "rape".

In this situation he was trying to coerce her into having sex after she already said no (i.e. he didn't accept her "no" and is threatening her into giving into him raping her) by threatening her privacy and reputation, not with physical violence. This is absolutely still rape since she already said no and he's threatening her.

Rape doesn't have to be a physically violent attack to be considered "rape", many victims freeze or fawn or comply and "let it happen" to protect themselves from seemingly worse harm. Not physically fighting back is still not consent.