cost basis

Clarification is needed to provide the specific answers you need. However a few pieces of information may be helpful.

If you purchase a business asset or property when you are ready to place it in service for business, the cost basis will be what you paid for it as well as any costs to purchase it.  If it's a building with land, then you must determine the land cost versus the building cost. This is usually determined by using the tax assessment from the local city or courthouse. For property other than real estate the cost would be used in the same circumstance.

If you had property that was used for personal purposes and then it was converted to business property you can use the lesser of these two:

1. The actual cost of the asset; or
2. The fair market value (FMV) on the date it was first placed in service for your YouTube business. 
   • You can determine FMV by checking various sites to determine what someone would pay for your camera in the current condition and age.

FMV:  This is what a willing buyer would pay a willing seller and neither having a reason to buy or sell (IRS terminology).