Stop MediaStream tracks at the end of the video check (livekit#1552)

Author: svajunas-budrys

.changeset/dull-otters-dress.md

@@ -0,0 +1,5 @@
+---
+'livekit-client': patch
+---
+
+Stop MediaStream tracks at the end of the video check

src/connectionHelper/checks/publishVideo.ts

@@ -83,6 +83,7 @@ export class PublishVideoCheck extends Checker {
       video.play();
     });
 
+    stream.getTracks().forEach((t) => t.stop());
     video.remove();
   }
 }