The article introduces the possibility of processing images of CCTV for purposes of forensic practice. Thanks to this calculation, a person who was wrongly convicted was released and declared innocent. The prediction of body height was performed using the basic knowledge of descriptive geometry and numerical acts of mathematics. The accuracy of the calculation depends on the quality of the video and the accuracy of the measurement at the crime scene. The methods used are sufficiently precise and can be a guide for further use in forensic biomechanics. The investigative trial has shown very reliably that the method of calculation used is sufficiently accurate, reliable and demonstrable, and therefore a person who has been wrongly recognized as guilty in this case must be exempt and declared innocent