We don't have any plans to directly support the Samsung Gear devices with Strava. However, Android users can sync activity data to Strava from the Samsung Health app.
1. Record your activity with the Samsung Health app and your Samsung Gear device.
2. Connect Samsung Health to Strava: From the main screen, go to "More" -> "Settings" -> "Connected Services"
3. Log into your Strava account. Workouts will then automatically be uploaded to Strava.
For additional questions, see this article on the Microsoft Health site.