As per Tuckman's model there are 4 stages of high- performing teams.

1. Forming

2. Storming

3. Norming

4. Performing

Given the question, I could relate to one of my experience where as a Scrum Master I was getting a Storming team, where all my developers were great at their individual work but there was lack of teamwork and communication within the team. There were lot of conflicts and teamwork was always a little of a challenge for them. 

So, what firstly I had to gain their their confidence and connected with each of them to understand the problem. And then, slowly in every possible meeting would do a fun team building games e.g.: human knots, blind drawing etc. 

Next, once I could see changes in their interactions which got better within few days, coached them about how team work can only help each other grow personally and professionally. Since they were still in second stage of Tuckman's there were still conflicts but I could see that we as a team were able to resolve most of them.

Then, again coached them about the importance of Agile manifestos and one of the scrum ceremonies' i.e. Sprint Retrospectives. In the beginning, would ask them to write their feedbacks anonymously and then eventually ending up with the improvement points. In later stages, there were open discussions about the issues, improvement items etc. which needed to be taken cared of.

Coming back to the question, as a Scrum Master, I could see a great difference and increase in the velocity and capacity(since now people were motivated to come to office and work with the team). Escaped defects were getting lesser in later sprints. And initially, there were lot of improvement points created as an output of the retrospective but one or none were being implemented and then the implementation of improvements got increased. Finally, the team were coming up with nominal improvement points and as team we were able to resolve them as well.

As a SM, I tried to show them empathy, was an active listener and used persuasiveness while communicating to them which helped them to open up to me and then coached them as and when required about Scrum, teamwork and manifestos. And as a team player, worked with them on my improvement areas as well. This not only helped me in improving my processes but gave them the insights that everyone needs improvements.

Hope this justifies your question. Please let me know if any key points were missed.