What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I'm not that familiar with tracking pixels, but I'm guessing they code snippets or HTML codes that shows an image of some sort with visits on it? You can try adding an Tracking pixel in the Thank you message, there's an HTML editor there that you can use to add the code.
If you are using Google Analytics, you can use our Google Analytics widget and add it to your form to track and collect visitor information.
Our developers also just release our own Form Analytics feature, you can learn more about it here: http://www.jotform.com/blog/150-Introducing-Form-Analytics
I hope that helps.