It is possible to encrypt and decrypt a secret text using openCV

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Simply hiding the plaintext in, say, the pixels' lower-end bits is not very secure. You should encrypt the plaintext using RSA or something beforehand. Make sure to salt the plaintext with (pseudo-)random bytes before encryption occurs, and use large primes (on the order of hundreds of digits), to make sure that the ciphertext is truly secure.

I have a C++ RSA code at: https://github.com/sjhalayka/RSA

If you need help let me know.

Is it possible to encrypt plain text using Rc4. And how we can form texture image from texture image samples using image quiliting

Really you should learn how to use google : https://www.researchgate.net/profile/...

Don't use RC4 -- the wikipedia page explains that it's not secure.