I don't do video shops, but the one I did do was an apartment complex and the MSC loaned me the gear.
There aren't enough near me to justify spending $5-600 on a "spy" camera. But it might be different in a big city or if you travel in your retirement. 5-6 video shops would recoup your expenditure, but you have to be signed up with the companies that offer those shops.
I'd suggest signing up with Marketforce and Intelli-shop as a start and then, if they have shops for you to do, don't take them at base pay, wait for bonuses. Especially on the fast food.
If you like it sign up for 5 new companies on the list on this forum every day. You never know when a company will land a client in your area.
Don't do targeted shops. The target typically knows they are beind shopped and won't be available for your phone call or visit in most instances.
Dont take fine dining or hotel shops unless you are very detailed and wouldn't mind spending a lot of time writing about your experiences. Search this site for Coyle discussions.
As mentioned, keep good records of your expenses including mileage to get to different locations.
Some people do routes of shops. Taking shops as they travel to wherever that cuts food, gas and entertainment expenses of the trip. Or the expressed purpose of travelers to shops nobody wants to go to for lucrative bonuses.
Most times it takes one or two shops of a certain type before you get the hang of it. Then the time required usually goes down dramatically.
Sorry for rambling. Hope this helps you.