how to make code deployed automatically in elb and updated in autoscale group

we have multiple servers running in elb. we have our repo in github. right now i deploy code in elb servers using fabric scripts in parallel and update AMI for autoscale group. these code are written in python and we are using mod-wsgi with apache2. we have to restart apache to refresh new code. is there any method the code refresh can be automatic without restarting apache2 ? now. i want my codes to be deployed automatically in each servers. since there are multiple servers in backend, i doubt if i can use webhook for deployment.

i do not want my presence for deployment of new codes available. i was going through git-deploy. but not able to understand how it deploy codes in multiple servers please help me for this how i can perform this task .

thanks