The author has developed or developing various intelligent systems for health care, action recognition and people monitoring by using visual sensors such as RGB cameras, LiDAR's or depth sensors. In this talk, many developed systems will be demonstrated and explained by using movies, where the high technologies are not necessarily required. These systems are not explicitly connected to the Internet, either. We will discuss the possible functions of such systems as IoTs if they are connected to the Internet. Also, some systems employ deep learning software. The advantages and disadvantages of using deep learning will also be discussed.