$ sudo snappy install webcam-demo

$ snappy list -v
Name        Date       Version Developer  
ubuntu-core 2015-06-08 80      ubuntu*    
ubuntu-core 2015-06-09 81      ubuntu!    
webcam-demo 2015-06-09 1.0.2   canonical* 
pi2         2015-06-08 0.12    * 

$ sudo systemctl status -l webcam-demo_webcam-demo_1.0.1.service
● webcam-demo_webcam-demo_1.0.1.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)