From where should i start to build this project can you please help me with steps.
How should i procees
Hey @rk221_b, these are the broad steps,
- load the eye and nose haarcascade classifiers,
- Load the image and run detectMultiscale to get the box around eyes and nose.
- Load the specs and mustache image, it is in rgba channel, one extra channel i.e. ‘a’ gives the opacity value of the image. If its transparent than it will be zero
- resize the mustache and specs to that size of nose and eyes detected.
- Iterate over the pixel values on eyes and nose, and replace them to that of specs/mustache whenever channel ‘a’ value of specs/mustache is greater than 0.
Hope this resolved your doubt. 
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