2. when they have some questions about product which they need or going to buy
Because he's showing him something including with camcorder. Probably he's asking about camera's screen
in the picture I can see two men. One of them is a shop assistant
he's wearing blue shirt. The second men is a customer. He's wearing black shirt and glasses. Man are about thirty.
The customer is holding a camcorder. Probably he is asking him how to use a camcorder.
In the background i can see a desk and monitor.