Dear maxlenormand19,
Thanks for contacting us.
Please be kindly informed that the issue you have faced is related to the fact that the videos are loaded over https. In order to get rid of that problem, please, open the file
portfolio-gallery\templates\front-end\view\full-width\full-width-view.php
line 140 and 205
and change
https://player.vimeo.com/video/
to player.vimeo.com/video/
Apply the same changes in the
portfolio-gallery\includes\class-portfolio-gallery-frontend-scripts.php file
line 271
https://player.vimeo.com/video/ => //player.vimeo.com/video/
For other views you can use the following files:
portfolio-gallery\templates\front-end\view\lightbox-gallery\lightbox-gallery-view.php
line 142
portfolio-gallery\templates\front-end\view\content-slider\content-slider-view.php
line 67 and 123
portfolio-gallery\templates\front-end\view\full-height\full-height-view.php
line 150, 216 and 282
https://player.vimeo.com/video/
portfolio-gallery\templates\front-end\view\toggle-up-down\toggle_up_down-view.php
line 143, 209 and 273
https://player.vimeo.com/video/
Please let us know your results.
Thanks