If your get an error “gtksink not found. No video preview available. Install the gstreamer 1.0 bad plugins version 1.8 or higher.” Open your terminal and use this command:
sudo apt-get install gstreamer1.0-gtk3
Done.
If your get an error “gtksink not found. No video preview available. Install the gstreamer 1.0 bad plugins version 1.8 or higher.” Open your terminal and use this command:
sudo apt-get install gstreamer1.0-gtk3
Done.