The issue got resolved after my bit bucket(Git) account reset. Hence, marking this issue as done.
Thanks for your suggestion but no luck for me and getting same error message.
$ git push -u origin master
fatal: remote error: CAPTCHA required
Your Bitbucket account has been locked. To unlock it and log in again you must
solve a CAPTCHA. This is typically caused by too many attempts to login with an
incorrect password. The account lock prevents your SCM client from accessing
Bitbucket and its mirrors until it is solved, even if you enter your password
correctly.
　
If you are currently logged in to Bitbucket via a browser you may need to
logout and then log back in in order to solve the CAPTCHA.
　
Visit Bitbucket at https://git.forge.lmig.com for more details.
The issue got resolved after my bit bucket(Git) account reset. Hence, marking this issue as done.
