How to open a lightbox with a video?

Question

I have a portfolio grid where I want the images to open up as a lightbox with a video. Somehow I cannot make that work. What do I do?

Please check the following article:

How to show video, project gallery or animated gif in portfolio grids / listings?

Note: If you wish to specify multiple different actions like linking to portfolio page AND opening the image lightbox AND linking to external URL etc. please use "Featured Image -> Multiple Choice" combination in "Appearance in Portfolio Grid" section. In this case respective icons will appear while hovering on the portfolio item in grid and this actions will happen by clicking on the hover icons.