Misses an incredibly important question about what's the guy's relationship to the girl. Harassment is generally legally defined as long-term pattern of behavior, in most if not all juridictions one-off thing like that wouldn't likely be illegal (Though it might violate obscenity/public decency laws depending on content and delivery). For various reasons everybody should be free to report to the authorities when they feel threatened, and it would also be useful for establishing pattern of behavior if it goes further.
Everything else depends on circumstances, for example did the guy know the girl did these kinds of videos, did he lead her on, was the video really graphic, since she was known for this was the video made public etc. In most circumstances I'd say she has the right, but has to also bear the consequences.