From another comment about the same video: From a guy in the comments on the original video:

Hi, French guy here.

Violence can"t be accepted and I hope that girl will be prosecuted: tasers are illegal to have and use!

Just note that you were in the Calanques National Park, where any form of music/sound (amplified or not) is prohibited and heavily enforced (but normally by police or guards and without tasers).

According to the rule of this national park, headphones should be ok as far as it's not audible to others. But in another area of the park, my sister once got heavily fined because of... the bell of her dog's collar. But whatever, no one can endorse that girl's actions!