Yes, as long as the footage is not blurry, properly exposed, and at least in high-definition format.
Yes, travel and accommodation costs must be added to the production costs.
Cost is depending on a number of factors such as locations, filming duration, video length, urgency (deadlines), and what the desired edit needs to look like and/or what type of effects the production needs. The more information we have about the project, the more of an accurate price we can give. We also work with predetermined budgets.