For wireless gaming you need a fast turnaround time. That's difficult even with 1 user.
For video streaming you need a high througput. So for streaming 50 video's simultaneously, you need a powerful device.
That's not the usual consumer device. So it's best to contact the professionals. Ask your local Cisco representative what they offer.
I want a router that can support 50-60 users for video streaming and gaming purpose that too primarily on the N band. Is there any router that can fit this? Range should be approx 25 mtrs.