i have a very simple trick to crack any gallery locked videos.
usually gallery lock applications rename the extension for any videos or images which keeps them safe.
requirement :- Mx player application (thats it)
Steps :- 1) open mx player go to settings option >> list and make sure the 'recognize .nomedia ' option is unticked and 'show hidden files and folders' option is ticked.
2) go to mx player settings >>list >> file extension. And add the extension which your gallery lock application uses while hiding the videos.
p.s. :- The application named "Gallery lock " uses .glh extension while hiding.
now just refresh mx player by clicking the refresh option available on top.
please hit thanx button if u like my trick