As per our understanding it's an Analytics use case. To achieve the same you can use "Success Event Pathing" concept. You have to pass the name of the Success Event to a Traffic Variable (sProp) on the page in which it occur & enable pathing on the same throguh Analytics Admin section . For your use case-
Step 1 s.prop1=<VideoName>;
Step2 s.prop1="Request a Demo Page";
Step3 s.prop1="Thank You Page"
Please find below links to some of the articles around the same :