You can connect a tracker (pixel) to the form. You need to add the pixel macro to its code.
For example, for Facebook, the macro would be fb_pixel=111111, where 11111 is the ID of your pixel.
The macro is added after the country=IT parameter.
Example:
<iframe src="https://xshopcart.com/form/?off=8eKMsewe&lnk=17575&m=414986b3&language=it&country=IT&fb_pixel=1111111111&select=countryDefault&s=EZyFrvEJ&color=blue&is_price=no" width="500" height="500"></iframe>