Website Template JAnderson - Item Support

Please, in the section PORTFOLIO I need to put videos. Besides the pictures I need to put videos that when I click, a window opens and show me the video in a magnific-pop-up.css for example.
Can you help me?

Thank you very much
Thank you very much for your help.
And if in the pop-up with an image I want to put text? How I can do?

Thank you very much
How can I resize the small images? I can't find the code:

@media screen and (max-width: 1200px)
.portfolio-item {
max-width: 200px;
height: 133px;

Thank you.
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Item Name:
JAnderson
Author:
Downloads:
4
Created:
2016-03-13
$10.00
Regular License
This item may be used for a single domain only.
$20.00
Extended License