Deduction for home office use of a portion of a residence is allowed only if that portion is exclusively used on a regular basis for business purposes. The part of your home must be your principal place of business.
If the room where your office is located would not qualify under this standard, perhaps there is a storage area where your video equipment is stored exclusively and on a regular basis.
To report the home office within your self-employment activity, select the expense category Home office.
See also this TurboTax Help.