SUP-2337 #message Hide native video tag when using KPlayer #time 0.5d

*Hide native video tag when using KPlayer
*Restore native video tag on player suable - e.g. when changing media -
for use case when change media will change player from KPlayer to
native player.
Merge pull request #759 from kaltura/SUP-2337

SUP-2337 #message Hide native video tag when using KPlayer #time 0.5d