Cleanup

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/java/com/nextcloud/talk/activities/CallActivity.java

@@ -566,6 +566,7 @@ public class CallActivity extends AppCompatActivity {
             videoCapturer.dispose();
         }
 
+
         if (localMediaStream.videoTracks.size() > 0) {
             localMediaStream.removeTrack(localMediaStream.videoTracks.get(0));
         }
@@ -573,8 +574,14 @@ public class CallActivity extends AppCompatActivity {
         if (localMediaStream.audioTracks.size() > 0) {
             localMediaStream.removeTrack(localMediaStream.audioTracks.get(0));
         }
+        localVideoTrack = null;
+        localAudioTrack = null;
+        localRenderer = null;
         localMediaStream = null;
 
+        videoCapturer.dispose();
+        videoCapturer = null;
+
         pipVideoView.release();
 
         String credentials = ApiHelper.getCredentials(userEntity.getUsername(), userEntity.getToken());