Hello,

1-Change the staff data font color:
There isn’t any option to customize this. You need to use custom css. Add this code into your Customize > General > Custom Codes > Custom Css box:

.cl_team.style-photo .team-item .team-name {
    color: #fdfdfd !important;   
}
.cl_team.style-photo .team-item .team-position {
    color: red !important;
}

Change the color to your wish.

2-You can add media to a row in Row settings > General > Video Background (screenshot). But the sound is not available in this option.

3-You may need to change the menu items color. If it’s the same as the background, you won’t see it. Can i please see a look of the site? So i can understand better the situation.

4-Go to page settings, click on the media element in slider and remove animation. See screenshot: https://postimg.cc/image/d4hvfdynb/

5-Yes, you can add any effect you want but you need to use custom css for this. Add the code in Customize > General > Custom Codes > Custom Css box. Please know that personal customizations are not included in support.

Best regards!