For the thumbnail I've resolved with this:

open video_providers.php you will notice they left the thumbnails as http this will cause you SSL issues if you wish to be rid of this just change http to https on line 129.

Change
const thumbUrlPattern = 'http://img.youtube.com/vi/()/default.jpg';
With this
const thumbUrlPattern = 'https://img.youtube.com/vi/()/default.jpg';

For play in newsfeed i will need to change from

div class="ow_newsfeed_item_picture">

<iframe width="459" height="344" frameborder="0" allowfullscreen="allowfullscreen" src="HTTP://www.youtube.com/embed/VIDEO">

</div>

to 

div class="ow_newsfeed_item_picture"><iframe width="459" height="344" frameborder="0" allowfullscreen="allowfullscreen" src="https://www.youtube.com/embed/VIDEO"></div>
Where I can do this change?
Thank you

Hello Simone,
Are you using any other 3rd party video plugin?

Simone is this the domain: www.incontrirock.com ?

I just registered at your website. I see you have no default newsfeed enabled on your website. Moreover the newsfeed plugin you have now plays the video. 

Is the issue resolved? 

Yes i've resolved it with "Attachment" plugin

Simone, we checked the issue on other community members website who has ssl certificate as well and we cannot reproduce video not playing in the newsfeed. 

Can you please PM me your admin details for the website? I'll take a look at the issue. 

hi ross, 

it's not an oxwall problem, it's a chrome beta and Firefox beta release problems that is blocks video mixing content (i see it on firebug). today I'll try with other browsers and I'll tell you the results. thank you. 

hi ross,

i haven't resolved the issue...

i have sent the admin detals in your mailbox...

thank you,

Simone

Simone, I just tested the newsfeed on your website and I can see the video in the newsfeed and I can even watch it, don't understand what the problem is. See screenshot

Is there a way to force all youtube videos to be https on the newsfeed the same as video section? Or when written to the newsfeed table in the database both image and video if http and site is https are then renamed https? if you know what i mean?

Steven, check this topic, please: http://www.oxwall.org/forum/topic/10307