@Anil_M, you posted a list of tutorials, but a lot of them are irrelevant. Please only filter out the relevant ones.
Siti, you may want to take a look at this?
Note: There is a bug with the Camera component. Therefore, please follow this as well if you would like to use the Camera component: Error 201 After Update 1.5.5 (Camera did not return an Image) - #6 by bodymindpower.