Here's the response I got:
If you want to operate in France just one time, you must send to this address
travail-aerien-bf@aviation-civile.gouv.fr :
1) Copies of your :
- operations manual or any documents with your operations procedures included
- your national aviation authorities authorizations (operation and airworthiness) and associated limitations
- remote pilot titles (theoretical and practical).
- insurance policy
2) Description (text + drawings/maps/photos) of your mission and of the flight area(s)
3) Description of the aircraft
3) DNC form for each remote pilot signed by the operator
4) Statement of compliance form signed by the operator
Limitations and conditions will be set according to the documentation provided and our regulation.
Please note that:
- for an operation in
urban area or near people gatherings, we request aircraft with a mass > 2 kg to be equipped with a
safety parachute (to be demonstrated to us), or to be tethered. Besides a
local police authorization will be needed in addition of ours.
- for an operation close to
aeronautical installations or in controlled airspace, you will need also a
specific authorization from local airspace and/or airfield authorities.
- during every operation, third parties (not linked to the shooting activity) must be kept at least at 30 m from the aircraft (on all its flight track). People linked to the activity can be closer (but not directly below) if they have been informed of the specific safety procedures in case of failures/emergencies and have signed a statement that they have been so informed.
B) If later you want to operate routinely in France, you must follow the same process as French operators, described here (sorry only in French):
http://www.developpement-durable.gouv.fr/Demarches-pour-effectuer-des.html
Follow the link to have access to our regulations translated into English :
http://www.developpement-durable.gouv.fr/document137398
You must send the documentation at least three weeks before the date of operation so please plan ahead. 
