Forest department is trying to create roadblocks. Anything professional and they want to make money. For documentary shooting it comes to close to 10k per day in bigger national parks.

So one needs to decide 1) if it is very important to shoot within the reserve forests. 2) If you are making money from it. If not, then no point. Just go as tourists.

There are tons of wildlife photos freely available in India. People are simply donating their photos for name. So professional wildlife photographers can't make money. So most of the wildlife photographers that you see are into tour organising to make money.