Dear Jelle,
If possible come in with a Journalist visa hence no permission is required. Generally Journalists carriy their gears, and shoot video of individuals. Regarding location hunting if you can specify the areas that you intend to visit it would make easier for a fixer to find the locations. Moreover please let me know the subject that you have in mind for this work.
India is a vast country with several cultures, languages, types of people invovled.It is very much necessary to pinpoint as to what you want to do. We have history that is older than 5000 years. Monuments are there that are from the 6th century AD till 17th Century most of them are being marked as World Heritage sites. Hence it is necessary what you want to portraw or research in India.
we are one of the service providers in India. Please log on to our web site http://www.apus.co.in for more details. In case you require further information on anything about India, do not hesitate to write to us.
Regards
Venugopal