How to add a background video to the homepage slider in Supply theme?

Supply is one of the most downloaded free themes from Shopify.

Why don't take advantage of its nice homepage to place one or more than one videos using Video background? 

This definitely can make your store look even better. 

It is possible to add videos to each slide easily using the following pattern:

ul.slides > li[data-flexslider-index="N"]:not(.clone)  img 

where N is the index of the slide starting from 0.

If we want to put the video on the first slide, we have to write this selector:

ul.slides > li[data-flexslider-index="0"]:not(.clone)  img 

and if we want to put the video on the third slide, we have to write this selector:

ul.slides > li[data-flexslider-index="2"]:not(.clone)  img 

To do so, let's go to the app preferences page and tap on the Add new video option.

 Once on this page, make sure to select the home page and Section Video Background options on the video location page, as well as to configure the selector mentioned before:

After this, you can click on Save and continue and introduce the desired video URL on the following page:

Finally, the video should be properly visible on the desired position.

Note that it is important to keep the target element transparent:

If we want to replace the entire slider, we can use this selector:

.flexslider