One development job that may involve CMMI and Scrum is likely going to be Release Engineering or Release Management either as a Release Engineer that is coming at things from a software development career path or coming at it from other directions, likely project management.
Depending upon the organization Release Engineering is going to have a fairly significant influence over software development as ultimately they are the group that is going to be signing off on the final version of software to be released, either as a Gold Master, binaries that are available to the public, or as part of a code migration pathway for continuous deployment as part of an SaaS model.
The other option is that you might want to look around for a company that has a formal standards implementation and compliance group of which the group name can pretty much be anything, I've seen at least one that was simply called "Software Engineering" with groups that did the actual product development having other names.
In terms of moving into such a position, it's really hard to say as to what the best way to go about doing it is as each company is going to view such a group differently. With proper education you might find your way into such groups fresh out of school (assuming that there are even open positions at that level) or it might take you a couple years of getting software development experience before you can make the move over. Having experience writing software does help if you are in such a group though so you might want to look into spending some time as a developer and then making a move to release engineering by building up any professional credentials that you may need to apply for such jobs (e.g. formal CMMI training, background in managing build systems or refactoring a build script for a major project, etc).
Or course, the disclaimer that needs to be applied to this is that different organizations approach problems differently and as a result things might be different depending upon where you are. I've seen some companies have the internal Release Engineering group be responsible for the development standards as they are responsible for what goes out the door where as others will have a formal standards group that does nothing but standards compliance.