You won't find that functionality with an existing module in Odoo. Odoo requires filling in all necessary information to save the data, so simply scanning a barcode and saving the data would require setting up default values. This requires taking action with complete information. For example, when creating a sales order, you may want to scan the product barcode to create the order, but customer, quantity, and other fields are mandatory, so you would need to configure them.

I'm currently developing a module where a production order can be created simply by scanning a barcode, and it will be released in the future. If you're interested, you can follow my progress.