No, Allstate does not have a dashcam discount, since no major car insurance company in the United States offers dash cam discounts as of March 2021. The closest thing Allstate has to a dashcam discount is Drivewise, which monitors policyholders' driving habits and adjusts their premiums accordingly.
Drivewise from Allstate is a type of usage-based insurance. The program tracks acceleration, braking, and the time of day that you drive and can save policyholders up to 25% rebate.
Even though Allstate does not offer a dashcam discount, purchasing a dash cam could still be worth it in the long run. For instance, dashboard cameras can help prove fault in a car accident, prevent insurance fraud, and provide evidence in traffic court.