This is my first implementation with Video. I have dataLayer on my clients website and I'm not sure which one to use Milestone(Legacy) or HeartBeat and please suggest which is the best to implement using the Launch. Also, please guide me with the implementation process.
With respect to launch, There is extension with name "Adobe Media Analytics for Audio and Video" which add the SDK code in the launch property and then you may need to create MediaHeartBeat tracker instance in custom code editor. Refer below Github link :