We've already had a couple of tutorials on side-by-side and split screen effects that are easily achieved in a few clicks with the Free version of VSDC Video Editor available for immediate download at http://bit.ly/2w3FrLy
This video how-to is for a bit more advanced effect - diagonal split screen video made with the help of 'Inverted mask'. Please, switch ON the subtitles and follow all the steps strictly as shown.
Related videos:
Ordinary splitscreen - • Lifehack: making a split screen video
Placing the same videos side by side - • How to place two videos side by side ...
Blending two videos in a creative way -
• How to blend two videos in a creative...