Photos and Video recording is absolutely prohibited in the Autographs room unless you purchase a photo with the guest.
Here is the Autographs Room policiy http://bronycon.org/about/policies/autographs/
I believe that some of the panels will also have the same thing. However I am unsure on which ones or if any. They should make some type of announcement in the panel room if this is the case. It is really up to the VIP Guests, the Staff, or the Con to keep everyone safe and abide by all policies of the Con and the convention center and each Guest.
Other places should be fine, just keep in mind everyone (no matter who) has the option to ask not to be photographed or taken video of them. Please if someone asks you that the photo or video makes them uncomfortable or dont want to be included to be kind and abide by their wishes.