Is this ventricular tachycardia?
I have looked at this ECG using LightWAVE.

The first part is showing atrial fibrillation or flutter with variable conduction because:


arrhytmia
no P waves or coarse fibrillatory waves
tachycardia at about 95-100 beats/minute
can be seen better in V1



Sample from 00:00:40

The second part is showing premature ventricular contractions with trigeminy because:


different morphology of QRS - ectopic 
wide QRS
two normal complexes followed by one ectopic
presence of the compensatory pause after PVC



Sample from 00:09:20

References:


ECG data: PhysioNET MIT-BIH Arrhythmia Database
ECG criteria: LearnTheHeart.com