In this paper, a new method for automated detection of a human region of interest is provided that makes use of camera surveillance in department stores. In this work, a region of interest is an area in the image where more people commute. For this purpose, first humans are distinguished from other objects in the image utilizing a histogram of oriented gradients (HOG) descriptors. Every detected individual is considered as an event in the image. Then, a non-parametric distribution based on Bayesian risk is applied to obtain the most interested regions from the position of detected humans. In the proposed distribution, a new high-efficiency kernel is provided. In Bayesian risk, a novel loss function is proposed that has a higher accuracy in compared with square loss function and performs better in finding peaks of a distribution function. For the evaluation, data from live surveillance cameras located in different parts of some stores are used. For the proposed kernel, on average, an accuracy of 85% and for the loss function, an accuracy of 93.5% on artificial data and 90% on real data are acquired which are better results in compared with other similar works.