Where can I find this video?

Her name is Sara Oks (in Cyrillic Сара Окс), here in a short clip titled Глубоко личный тренер (in English google translated to "In-depth personal trainer"), broadcast as part of a Russian "mainstream" comedy series titled Счастливый конец aka Schastlivy Konetz (in English google translated to "Happy Ending") in 2012.

Stream (full clip - 2:56 min):
https://hlamer.ru/video/393307-Sara_Oks-Za_gurd_schastlivyiy_konets

OPs gif starts at mark 1:26 min into this stream.

Notes:

This is not porn!

I don't know the exact episode in which this clip was included.

If you want to watch more clips with her from this series, you can find them on her official account on YouTube. Just scroll back in the list of videos and you'll find them. For example, this one:

https://www.youtube.com/watch?v=2Z2Qpgv8S1Y

References:
https://www.imdb.com/title/tt12775478/
https://hlamer.ru/channel/schastliviykonec

Sara Oks
http://sara-oks.com/
https://www.instagram.com/sara__oks
https://vk.com/saraoks
https://www.facebook.com/singersaraoks/
https://www.youtube.com/channel/UCfskrjfOnlAN86wQLhRPsUA

https://www.imdb.com/name/nm6440328

Her name is Sara Oks (in Cyrillic Сара Окс), here in a short clip titled Глубоко личный тренер (in English google translated to "In-depth personal trainer"), broadcast as part of a Russian "mainstream" comedy series titled Счастливый конец aka Schastlivy Konetz (in English google translated to "Happy Ending") in 2012.

Stream (full clip - 2:56 min):
https://hlamer.ru/video/393307-Sara_Oks-Za_gurd_schastlivyiy_konets

OPs gif starts at mark 1:26 min into this stream.

Notes:

This is not porn!

I don't know the exact episode in which this clip was included.

If you want to watch more clips with her from this series, you can find them on her official account on YouTube. Just scroll back in the list of videos and you'll find them. For example, this one:

https://www.youtube.com/watch?v=2Z2Qpgv8S1Y

References:
https://www.imdb.com/title/tt12775478/
https://hlamer.ru/channel/schastliviykonec

Sara Oks
http://sara-oks.com/
https://www.instagram.com/sara__oks
https://vk.com/saraoks
https://www.facebook.com/singersaraoks/
https://www.youtube.com/channel/UCfskrjfOnlAN86wQLhRPsUA

https://www.imdb.com/name/nm6440328