1. A method for estimating efficiency of an employee of an organization, the method comprising: receiving, by an estimation computing device, input data from one or more data sources; classifying, by the estimation computing device, the input data into one of location data, video data, voice data and text data of the employee; generating, by the estimation computing device, a trajectory information of the employee using the location data and the video data; correlating, by the estimation computing device, the trajectory information, the voice data and the text data; and estimating, by the estimation computing device, efficiency of the employee based on the correlation.