Follow procedure :-
Once you take video than if you want to take Screen shot and Using VLC or GOM player than just do simple thing
----
1. for VLC:- press CTRL+ALT+S and Check Your file in Output folder inside my Document<< my Pictures
2....
more... for GOM:- Press CTL+E than Check your output folder
----
For uploading a video once you upload your video on "Youtube" than while posting you get one Red colour "Tube" tab click on that and paste your Video URL after That Click on Post . so you are able to upload Video and take screen shot as well
----
Thanks