Function encode_video_native 

pub fn encode_video_native(
    weights: &Vjepa2EncoderWeights,
    cfg: &Vjepa2Config,
    video_ncthw: &[f32],
    batch: usize,
) -> Result<Vjepa2EncoderOutput, Error>

Encode a pre-normalized video tensor [C, T, H, W].