Graphical Artifacts

Hi, I'm building my first Hackintosh almost with success (I've managed to boot to system) - I'm having graphical glitches, which also appeared when installing stuff. I'm using Intel HD Graphics 630. What I should do now to fix it? Link to short video of issue: https://photos.google.com/share/AF1QipOJLd06AucQSbR5rHN7zVRy45auZqy7Xc1rJ0FqEFKjcI1yrYwrFp7a4rJXwhKPkg?key=dW0yVGQzbmNMZnBlbGJyUU5CVkZMbWIwbC1ZallR