YPG declares war on Turkey

This is nonsense, the video you link is private stuff from some guys. In reality, the opposite is true: Rojava (including its YPG defences forces) seeks and would appreciate decent relations with all decent people, including Turkey.

YPG General Command said they have no links to the Ankara attack, remarking that Davutoğlu put forward this accusation to pave the way for an offensive on Rojava and Syria

Spokesman of the Syrian Democratic Forces (SDF), of which YPG is the largest component, condemns terrorist act which targeted Ankara

US Spox Kirby rejects Turkish PM Davutoglu's "certain link w YPG" assertion

U.S. State Department spokesman: Turkey may withdraw from the coalition if it wants

The head of Syrian Kurdish PYD, the majority party of Rojava region of which YPG are the defence forces, denies Ankara attack responsibility

The head of the Syrian Kurdish Democratic Union Party (PYD) on Thursday denied Turkish allegations that the group was involved in a bombing in Ankara that killed 28 Turkish soldiers. “We deny any involvement in this attack,” Salih Muslim told AFP, after Turkey’s prime minister Ahmet Davutoglu accused his party’s armed wing of carrying out the attack (...) “We have never heard of this person Salih Necar,” said Muslim. “These accusations are clearly related to Turkish attempts to intervene in Syria,” he added.